apparmor: Fix kernel-doc

Fix function name in security/apparmor/label.c, policy.c, procattr.c
kernel-doc comment to remove some warnings found by clang(make W=1 LLVM=1).

security/apparmor/label.c:499: warning: expecting prototype for
aa_label_next_not_in_set(). Prototype was for
__aa_label_next_not_in_set() instead
security/apparmor/label.c:2147: warning: expecting prototype for
__aa_labelset_udate_subtree(). Prototype was for
__aa_labelset_update_subtree() instead

security/apparmor/policy.c:434: warning: expecting prototype for
aa_lookup_profile(). Prototype was for aa_lookupn_profile() instead

security/apparmor/procattr.c:101: warning: expecting prototype for
aa_setprocattr_chagnehat(). Prototype was for aa_setprocattr_changehat()
instead

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>