Prox 156 f1 a687 bdadef7

[gpeng1216]

Updates-
change nrf_gpio back to clear and set for PROX_BOOST_ENABLE and PROX_VDD_EN respectively

Updates-

1. enable BLE
2. enable PILL_ANT_TYPE_HLO_ANT_DEVICE_TYPE_PILL1_5

Updates-

1. Remove ANT_SENSE_RESPONSE_HEARTBEAT
2. Remove divide by 1

Updates-

1. Disable internal pullup 13k Ohm with the external 100k Ohm pull up for Low power I2C mode.
2. Config 4x gain and offset (cap1) for prox
3. 24 bit enob output
4. disable BLE for this trial

[plasticchris]

debug code?

[zer0page]

please reenable for integration, and disable it locally for testing ( or keep in separate branch)