p930/vs920: Updates for kitkat

 * Remove TARGET_DEVICE override for vs920
   (see https://github.com/CyanogenMod/android_device_lge_vs920/commit/dd4607593a4853126d5d5157ec0b9f80e99dd508)

 * Update boot animation

Change-Id: I8c2097517f96c02eb70b98be8ae2d3df5e9c5f78