g2: Add libqc-opt property override

* libqc-opt is located in /vendor/lib not /lib

Signed-off-by: houst0nn <houstonn@gmail.com>
g2: init: update cpufreq settings

Signed-off-by: houst0nn <houstonn@gmail.com>
g2: update default wallpaper & screen brightness

Signed-off-by: houst0nn <houstonn@gmail.com>