leds: leds-qpnp: enable parsing of multiple leds at same address

This requires modifying current dt files for devices compatible
with leds-qpnp to use child nodes for each led.  This is desirable
to support different types of LEDs in the future.

Change-Id: I839cb1e4b7ee4118ffcb69f1c46eadefe682338d
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>