input: qpnp-power-on: add support for PON_GEN3 subtype PON peripherals

Add support to control PON_GEN3_PBS and PON_GEN3_HLOS subtype
PON peripherals.  These support a more limited feature set than
previous PON peripherals.

Change-Id: Id76ccc6ffd285ac68f350fb194f70bbbb04bd558
Signed-off-by: David Collins <collinsd@codeaurora.org>