[bsp][tms320f28379d] Fix compile ti (#6254)

* compile_ok

Issues fixed:
(1) update .config: select FINSH_USING_SYMTAB
(2) add rt_size_t in rtconfig_project.h
(3) fix finsh problems of using sym table
(4) update .project to include ipc source codes.
Todo list:
(1) automate the build source selection of ccs and reconcile it with scons

* change compiler

* msh can run now

the key step is to swap the order of rt_interrupt_nest -- and RT_OBJECT_HOOK_CALL(rt_interrupt_leave_hook,()) in irq.c. This is an improvised solution and an issue has been raised.

* Update 2837x_FLASH_lnk_cpu1.cmd

The original one is also fine. Just to make it more rigorous since FSymTab is in data section.

* update readme.md

Complier selection and maintainer update.

Co-authored-by: YuQi <qiyu_sjtu@163.com>

libcpu/ti-dsp/c28x/context.s

@@ -9,7 +9,7 @@
 ; 2019-06-17     zhaoxiaowei  fix bugs of old c28x interrupt api.
 ; 2019-07-03     zhaoxiaowei  add _rt_hw_calc_csb function to support __rt_ffs.
 ; 2019-12-05     xiaolifan    add support for hardware fpu32
-;
+; 2022-06-21     guyunjie     trim pendsv (RTOSINT_Handler)
 
     .ref   _rt_interrupt_to_thread
     .ref   _rt_interrupt_from_thread
@@ -191,8 +191,8 @@ _reswitch2:
 
      .asmfunc
 _RTOSINT_Handler:
-; disable interrupt to protect context switch
-    DINT
+    ; disable interrupt to protect context switch
+    ; DINT ;this is done by hardware so not needed
 
     ; get rt_thread_switch_interrupt_flag
     MOV     AR0, #_rt_thread_switch_interrupt_flag
@@ -248,8 +248,8 @@ switch_to_thread:
     RT_CTX_RESTORE     ; pop r4 - r11 register
 
 rtosint_exit:
-    ; restore interrupt
-    EINT
+    ; do not restore interrupt here: to be restored according to the
+    ; switched-to context during IRET (automaticlly by hardware)
 
     IRET
     .endasmfunc