Move qtaguid API out of libcutils

The qtaguid kernel module will be deprecated on devices running 4.9
kernel or above and we need to support both old and new module in
userspace. Netd is responsible for choosing which kernel module to use
and all the current qtaguid native implementation need to be hided
behind it. So the current qtaguid native API implementation will be
moved to a isolate library under system/core and only netd can access to
it. The libcutils qtaguid API will become a wrapper to send request to
netd module. This modification will make sure the apps that currently
using this native API will not be broken.

Bug: 30950746
Test: All cts and vts test related should not fail.
Change-Id: I9de98a25ed5dc71bbf520ee0aadd16d59025699a