msm: HTC: zara: remove wifi bus scaling
msm: HTC: zara: remove gsbi8 device from common_devices
msm: HTC: zara: Fix display_on without USB plugged in.

* Remove power key from board_keypad_map.
* Increase kpd_trigger_delay_us to 15625
* Enable CONFIG_INPUT_PMIC8XXX_PWRKEY