include:fix zephyr conflicting types and function

The atomic code is implemented in zephyr. When sof is used as
a zephyr module, there is no need to reimplement atomic.
The modification here is to solve the problem of repeated
definition of atomic related content.

Signed-off-by: Yang XiaoHua <yangxiaohuamail@gmail.com>

src/include/sof/atomic.h

@@ -5,6 +5,9 @@
  * Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
  */
 
+#ifdef __ZEPHYR__
+#include <sys/atomic.h>
+#else
 #ifndef __SOF_ATOMIC_H__
 #define __SOF_ATOMIC_H__
 
@@ -37,3 +40,5 @@ static inline int32_t atomic_sub(atomic_t *a, int32_t value)
 }
 
 #endif /* __SOF_ATOMIC_H__ */
+
+#endif /*__ZEPHYR__ */