apparmor: Fix kernel-doc warnings in apparmor/policy_compat.c

Fix kernel-doc warnings:

security/apparmor/policy_compat.c:151: warning: Function parameter
or member 'size' not described in 'compute_fperms'
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>

security/apparmor/policy_compat.c

@@ -143,6 +143,7 @@ static struct aa_perms compute_fperms_other(struct aa_dfa *dfa,
  * compute_fperms - convert dfa compressed perms to internal perms and store
  *		    them so they can be retrieved later.
  * @dfa: a dfa using fperms to remap to internal permissions
+ * @size: the permission table size
  *
  * Returns: remapped perm table
  */