[ipc] support of lockless rt_completion (#8887)

* [ipc] lockless rt_completion implementation

The new rt_completion implemented by lockless algorithm can improve timer resolution for up to ~12%, compare to sem IPC.

Signed-off-by: Shell <smokewood@qq.com>

* fixup: error

* remove useless changes

---------

Signed-off-by: Shell <smokewood@qq.com>

include/rthw.h

@@ -227,7 +227,8 @@ void rt_hw_secondary_cpu_up(void);
  * secondary cpu idle function
  */
 void rt_hw_secondary_cpu_idle_exec(void);
-#else
+
+#else /* !RT_USING_SMP */
 
 #define RT_DEFINE_HW_SPINLOCK(x)    rt_ubase_t x
 
@@ -235,13 +236,13 @@ void rt_hw_secondary_cpu_idle_exec(void);
 #define rt_hw_spin_unlock(lock)   rt_hw_interrupt_enable(*(lock))
 
 
-#endif
+#endif /* RT_USING_SMP */
 
 #ifndef RT_USING_CACHE
-#define rt_hw_isb()
-#define rt_hw_dmb()
-#define rt_hw_dsb()
-#endif
+    #define rt_hw_isb()
+    #define rt_hw_dmb()
+    #define rt_hw_dsb()
+#endif /* RT_USING_CACHE */
 
 #ifdef __cplusplus
 }