WIP
WIP: a6/max8903b swapout
WIP: usb_multi_charger_detect
WIP: fix compile errs wrt USB_HOST_NOTIFY
Revert "WIP: fix compile errs wrt USB_HOST_NOTIFY"

This reverts commit a0f2b2d1aa005b29b9fa63cbd7b3872b1fabf37c.
Revert "WIP: usb_multi_charger_detect"

This reverts commit bc7ae6f7bab979d68dfbde0fa67d34bfe4eec457.
WIP: set AC charger 2000mA
WIP: add LM8502 (leds/vib)