msm: sde: move early splash's node parsing code for msm8996 auto

This change is to move specific node parsing code to other place
for early splash feature on auto platform, not impacting kernel
booting process of other platforms.

Change-Id: I6deed1a75545c82ee777d9b4269f1420ab2eb07a
Signed-off-by: Guchun Chen <guchunc@codeaurora.org>