disp: msm: sde: save register write logs in dump

Changes are made to add register write logs to memory dump.
This can be extracted from crash dumps and used for analysis.

Change-Id: If46aaa4ae68f83c79d4b51cbe5dfd22340aa991d
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>