apparmor: Fix some kernel-doc comments

Remove warnings found by running scripts/kernel-doc, which is caused by
using 'make W=1'.
security/apparmor/policy_ns.c:65: warning: Function parameter or member 'curr' not described in 'aa_ns_name'
security/apparmor/policy_ns.c:65: warning: Function parameter or member 'view' not described in 'aa_ns_name'
security/apparmor/policy_ns.c:65: warning: Function parameter or member 'subns' not described in 'aa_ns_name'
security/apparmor/policy_ns.c:65: warning: expecting prototype for aa_na_name(). Prototype was for aa_ns_name() instead
security/apparmor/policy_ns.c:214: warning: Function parameter or member 'view' not described in '__aa_lookupn_ns'
security/apparmor/policy_ns.c:214: warning: Excess function parameter 'base' description in '__aa_lookupn_ns'
security/apparmor/policy_ns.c:297: warning: expecting prototype for aa_create_ns(). Prototype was for __aa_find_or_create_ns() 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>