Cherry-picked commit from id10terror/loki

Added Verizon LG G Pad 8.1 Loki signature

https://github.com/id10terror/loki/commit/028dc47c94e2cace490f7a929f5284b8dd00ac92
BoardConfig.mk, separating out config common to all variants to LG G Pad to BoardConfigCommon.mk
device.mk, separating out config common to all variants to LG G Pad to device-common.mk