g3: Clean up BoardConfig
g3: Remove dtbtool

* Use the CM variant in qcom/common instead.
g3: Remove libsensors
g3: Remove unused packages
g3: Clean up device makefile
g3: Remove default keylayout files

* These are provided by frameworks/base/data/keyboards
g3: Move initscript files to rootdir
g3-common: Clean up proprietary file list
g3-common: Update proprietary extraction scripts
g3-common: Move QMI-related libraries to device
g3-common: Import GPS HAL

* Qualcomm package version: AU_LINUX_ANDROID_LNX.LA.3.5.1_RB1.04.04.02.048.041
g3-common: Use dtbToolCM
g3-common: Remove LD_PRELOAD
g3-common: Update overlay items
g3-common: Add power profile from LGE stock
g3-common: Move wifi calibration files to vendor, clean up config
g3-common: Add vendor config for bluetooth, move firmware
g3-common: Add basic SELinux policy
g3-common: Remove custom audio_effects.conf
g3-common: Move defconfig to device repository