wifi-services-srcs: Stop using KeyValueListParser from android.internal

This class introduces a lot of transitive dependencies.

Also, rename the filegroup name to be consistent with wifi service name
(wifistack is no loner relevant).

Bug: 142809066
Test: Compiles
Change-Id: I87f6d7ec15888a10338518631f04d91fc8524a56
1 file changed