ARM: dts: msm: Specify AMOLED regulator device for kona platforms

Add AMOLED regulator device in PM8150A that controls OLEB/AB/IBB
modules which powers the triple supply needed for AMOLED panels.
Enable the AMOLED regulator device for kona platforms.

Change-Id: I9f03d0fdce8e260c17bacecc27defe8a5a998000
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>