spade: use .hpin_gpio instead of .hpin_irq for headset_pmic (Evervolv)

Based on:
https://github.com/Evervolv/android_kernel_htc_msm7x30-3.0/commit/37922607f2bb74e8bbb396323b4aa5cc2dd2dfdf
isl29028: switch proximity status to far when psensor is disabled