ANDROID: netfilter: xt_qtaguid: 3.10 fixes

Stop using obsolete procfs api.

Signed-off-by: Arve Hjønnevåg <arve@android.com>

[AmitP: Folded following android-4.9 commit changes into this patch
        564729173b12 ("netfilter: xt_qtaguid: fix memory leak in seq_file handlers")
        85a2eb5b48fc ("ANDROID: netfilter: xt_qtaguid: 64-bit warning fixes")]
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>