arch/tricore: idle donot depend on illd

Replace the iLLD Ifx_Ssw_infiniteLoop() helper in the idle path with
a self-contained 'loopu' instruction wrapper (tricore_idle_loop()).
The 'loopu' (loop unconditional) instruction branches back to itself
until an interrupt is taken, which is the standard TriCore low-power
idle sequence; the GNU and Tasking assemblers spell the backward
label differently, so the macro dispatches on the toolchain.

This removes the arch/tricore idle path's dependency on the Infineon
iLLD/Ssw layer.  No behavior change: the loop is still interrupted by
any IRQ that causes a context switch away from the idle task.

Signed-off-by: zhangyu117 <zhangyu117@xiaomi.com>

arch/tricore/src/common/tricore_idle.c

@@ -32,6 +32,16 @@
 
 #include "tricore_internal.h"
 
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#if defined(__TASKING__)
+#  define tricore_idle_loop() __asm__ volatile ("1: loopu 1p")
+#else
+#  define tricore_idle_loop() __asm__ volatile ("1: loopu 1b")
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -67,10 +77,7 @@ void up_idle(void)
   board_autoled_off(LED_CPU);
 #endif
 
-  /* This would be an appropriate place to put some MCU-specific logic to
-   * sleep in a reduced power mode until an interrupt occurs to save power
-   */
+  tricore_idle_loop();
 
-  Ifx_Ssw_infiniteLoop();
 #endif
 }