apparmor: make all generated string array headers const char *const

apparmor: make all generated string array headers const char *const

address_family_names and sock_type_names were created as const char *a[],
which declares them as (non-const) pointers to const chars. Since the
pointers themselves would not be changed, they should be generated as
const char *const a[].

Signed-off-by: Ryan Lee <ryan.lee@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>