Update the sepolicy for thermalhal to read sysfs_gpu to access the basic
gpu info.
Bug: 336698561
Test: Flash Build and boot to home, run adb shell dumpsys android.hardware.thermal.IThermal/default, check the cdevceiling and hardlimit number for gpu
Change-Id: I6e722e108284ee0d7a0c86a9e50749ecf4b354a5
Signed-off-by: Peter (YM) <peterym@google.com>