g2: Use QCOM PowerHAL

Preferable that we use the 2.5.18 QC-OPT (I'll open a pull request
at TheMuppets)

Change-Id: I1c1698d8ae0e34f7c2deffd8b8fdf66f0b915f22
g2: Move kernel dependency to common

Change-Id: I597bceb6b4590f5ef230fdc3100feebf235a2577
g2: Clean common NFC

-Current system screws up ALL variants NFC
-Replace libnfc-brcm.conf with stock for d80x and vs980 and move
 to device repos
-Add sepolicy for /dev/pn544 for ls980's PN544 chip

Change-Id: I347f68948a88074122675ca372757658598eaabb