leds: leds-qpnp: Add support for MPP controlled leds

Add appropriate settings to allow software to control
leds via MPP ports.

Change-Id: I923e31756526b6afa91ec41efc64414f63b8b888
Acked-by: Chun Zhang <chunz@qti.qualcomm.com>
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>