ARM: dts: msm: move common nodes to sde display for SM8150

Move the device tree nodes which are common for all variants
of SM8150 to main sde display device tree so that they can
be used for any hardware variant.

CRs-Fixed: 2223812
Change-Id: I6e860fa4f9463645466fa086812f966b1c34a257
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>