Branched from android_device_lge_v500

Modified all references of v500 to vk810
v500->vk810
awifi->altev
Cherry-picked commit from id10terror/loki

Added Verizon LG G Pad 8.1 Loki signature

https://github.com/id10terror/loki/commit/028dc47c94e2cace490f7a929f5284b8dd00ac92
Fixed compile error with packages/apps/Settings

packages/apps/Settings/src/com/android/settings/hardware/DisplayColor.java:109: cannot find symbol
symbol  : method getDefValue()
location: class org.cyanogenmod.hardware.DisplayColorCalibration
                int defaultValue = DisplayColorCalibration.getDefValue();