ARM: dts: msm: Enable display for sdm450 pmi632 and msm8953 platform

Add panel power supply nodes in pmi632 for sdm450 and in msm8953 mtp and
cdp platform.
Enable pwm node for backlight control.

Change-Id: I962d644be34f8d403dd73514b1a9becd510d3338
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>
Signed-off-by: Rashi Bindra <rbindra@codeaurora.org>