ARM: dts: msm: add PON regulator support to flash LED

Add multiple power source, in order to support PON
regulator for torch/switch node. Torch/Switch node can
enable PON regulator when torch is in use and disable it
when torch disablement is called, in order to
notify PON regulator to set/deset spare bits to prevent from
blinking when torch is in suspend.

Change-Id: I573b8927c40a8425c8f4a3911d1775c3b4b80db2
Signed-off-by: Jigarkumar Kishorkumar Zala <j_zala@codeaurora.org>