u8800: Disable & Remove leds.

Remove leds used in the reference boards.
pmic8058: Move from PM8058 PWM to PM8XXX PWM.

PM8058 now uses the generic PWM driver instead of its own.
u8800: Disable & Remove PM8058 PWM driver. Enable PM8XXX PWM driver.
pmic8058: Move from PM8058 leds to PM8XXX leds.

PM8058 now uses the generic PM8XXX leds driver.
u8800: Add & Enable PM8XXX leds.

Currently only button backlight led is added.