include: arch: ffs: include toolchain.h

Modify the include of toolchain/common.h to toolchain.h
The reason why we should/cannot include toolchain/common.h
is that it has an #error if included directly, and it
requires including it via toolchain.h instead.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

include/zephyr/arch/common/ffs.h

@@ -11,7 +11,7 @@
 #ifndef _ASMLANGUAGE
 
 #include <zephyr/types.h>
-#include <zephyr/toolchain/common.h>
+#include <zephyr/toolchain.h>
 
 #ifdef __cplusplus
 extern "C" {