Game Driver: process sphal libraries in GPU service

This change adds the sphal libraries text file parsing to the GPU
service. As the result, when the Game Driver apk is updated, the sphal
library list will be read out to the GAME_DRIVER_SPHAL_LIBRARIES
settings global property to be used in the graphics environment to
extend the current linker namespace.

Bug: 124448366
Test: Build, flash and boot. Install the apk to verify settings global.

Change-Id: Ifb4007a1fe7269e0a2857fe7badc8642342b1449