include: bm_zms: add missing atomic.h include

Adds missing include for `atomic.h`.

Signed-off-by: Mirko Covizzi <[email protected]>

Author: MirkoCovizzi

include/bm_zms.h

@@ -9,6 +9,7 @@
 #define ZEPHYR_INCLUDE_FS_BM_ZMS_H_
 
 #include <sys/types.h>
+#include <zephyr/sys/atomic.h>
 #include <stdbool.h>
 #include <bm_storage.h>