integrity: reduce storage size for ima_status and evm_status

This patch reduces size of the iint structure by 8 bytes.
It saves about 15% of iint cache memory.
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>

security/integrity/integrity.h

@@ -50,8 +50,8 @@ struct integrity_iint_cache {
 	u64 version;		/* track inode changes */
 	unsigned short flags;
 	struct evm_ima_xattr_data ima_xattr;
-	enum integrity_status ima_status;
-	enum integrity_status evm_status;
+	enum integrity_status ima_status:4;
+	enum integrity_status evm_status:4;
 };
 
 /* rbtree tree calls to lookup, insert, delete