apparmor: add the ability to report a sha1 hash of loaded policy

Provide userspace the ability to introspect a sha1 hash value for each
profile currently loaded.

Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Seth Arnold <seth.arnold@canonical.com>

security/apparmor/include/apparmorfs.h

@@ -82,6 +82,7 @@ enum aafs_prof_type {
 	AAFS_PROF_NAME,
 	AAFS_PROF_MODE,
 	AAFS_PROF_ATTACH,
+	AAFS_PROF_HASH,
 	AAFS_PROF_SIZEOF,
 };