power_supply: Add additional USB PD properties

Add additional properties for USB PD usage:
- POWER_SUPPLY_PROP_PD_IN_HARD_RESET is set when PD is
  undergoing a hard reset
- POWER_SUPPLY_PROP_PD_CURRENT_MAX used to indicate the
  current limit as negotiated over PD
- POWER_SUPPLY_PROP_PD_USB_SUSPEND_SUPPORTED is set when
  USB suspend current limit must be honored when USB bus
  is suspended

Also add enums to distinguish PD activity state: inactive, active.

Change-Id: I0a3d98ac1e1202e5b655b2e3a8102691b61359c8
Signed-off-by: Jack Pham <jackp@codeaurora.org>