Initial LG LED bringup

-Add support for thundera (P500/P506)
-Add LG stuff into lights driver
Signed-off-by: Rashed Abdel-Tawab <rashedabdeltawab@gmail.com>

Change-Id: Ib99fce9bf4537904ed5d45bcd1b568505050542f
LED driver: add shutdown routine

In case of using vbat power, we should be turn off the peripheral
when reboot or power down.
Signed-off-by: Rashed Abdel-Tawab <rashedabdeltawab@gmail.com>

Change-Id: I8b0a82f0296c092f97c7fd413b66a2326ee1fe5e