apparmor: fix obsoleted comments for aa_getprocattr() and audit_resource()

Update the comments for aa_getprocattr() and audit_resource(), the
args of them have beed changed since commit 76a1d263 ("apparmor:
switch getprocattr to using label_print fns()").

Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>