Documentation: Add docummentation for Infineon’s AURIX TriCore architecture

This commit add documentation for the Infineon’s AURIX TriCore architecture.

Signed-off-by: chao an <anchao@lixiang.com>

Documentation/platforms/tricore/index.rst

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+=======
+TriCore
+=======
+
+All TriCore source reside in lower-level common, chip-specific, and architecture-specific
+directories.
+
+arch/tricore/src/common/ Directory
+==================================
+
+This directory holds source files common to all TriCore architectures.
+
+Architecture-Specific Directories
+=================================
+
+Architecture-specific directories hold common source files shared for by
+implementations of specific TriCore architectures.
+
+``TriCore``
+  This directory holds logic appropriate for any instantiation of the 32-bit
+  TriCore architecture.
+
+Chip-Specific directories
+=========================
+
+For SoC chips, in particular, on-chip devices and differing interrupt
+structures may require special, chip-specific definitions in these chip-
+specific directories.
+
+The core Chip implementation is based on Infineon Low Level Drivers (iLLDs).
+The unified API is more friendly to developers familiar with Infineon SDK/HAL.
+We can get more code examples on Infineon's official Github: `AURIX_code_examples <https://github.com/Infineon/AURIX_code_examples>`__
+
+``TC3xx``
+  This is the implementation of NuttX on the Infineon’s AURIX™- TC3xx microcontroller family.
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   */*

Documentation/platforms/tricore/tc397/boards/kit_a2g_tc397_tft/index.rst

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+=================
+KIT_A2G_TC397_TFT
+=================
+
+This page file describes the contents of the build configurations available
+for the NuttX TriCore port.
+
+Infineon’s AURIX™- TC3xx `KIT_A2G_TC397_TFT <https://www.infineon.com/cms/en/product/evaluation-boards/kit_a2g_tc397_5v_tft>`__ Board
+=====================================================================================================================================
+
+This port should work on KIT_A2G_TC397_TFT with a proper CPU.
+The mandatory CPU features are:
+
+* System Timer (STM)
+* Asynchronous Serial Interface(ASCLIN) UART
+* IRQs are managed by Interrupt Router(INT), IR Service Request Control Registers(SRC).
+
+Toolchains
+==========
+
+Currently, only the Infineon’s AURIX™ Tasking toolchain is tested.
+
+Configurations
+==============
+
+Common Configuration Notes
+--------------------------
+
+1. Each Tricore TC397 configuration is maintained in a sub-directory
+   and can be selected as follow::
+
+     tools/configure.sh tc397:<subdir>
+
+   Where ``<subdir>`` is one of the configuration sub-directories described in
+   the following paragraph.
+
+   NuttX Shell::
+
+     tools/configure.sh tc397:nsh
+
+2. These configurations use the mconf-based configuration tool.  To
+   change a configurations using that tool, you should:
+
+   a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+      see additional README.txt files in the NuttX tools repository.
+
+   b. Execute ``make menuconfig`` in nuttx/ in order to start the
+      reconfiguration process.
+
+3. By default, all configurations assume the Linux.  This is easily
+   reconfigured::
+
+     CONFIG_HOST_LINUX=y
+
+Configuration Sub-Directories
+-----------------------------
+
+ostest
+------
+
+The "standard" NuttX examples/ostest configuration.

Documentation/platforms/tricore/tc397/index.rst

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+=============
+TriCore/TC397
+=============
+
+**TriCore/TC397** An TriCore flat address port was ported in NuttX-12.0. It
+consists of the following feautres:
+
+- Runs in Supervisor Mode.
+- IRQs are managed by Interrupt Router (INT), IR Service Request Control Registers (SRC).
+- Used System timer (STM) for systick.
+
+This kernel with ostest have been tested with
+
+-  Infineon's AURIX™ TC397 Evaluation Board: KIT_A2G_TC397_5V_TFT
+
+Supported Boards
+================
+
+.. toctree::
+   :glob:
+   :maxdepth: 1
+
+   boards/*/*