msm: mdp3: xlog dump on fatal error

This dumps the necessary mdp registers for debug
when a fatal error occurs in msm8909w. The fatal
error can be a dma timeout or ppp timeout or an
smmu fault. This even populates necessary info to
debug structure.

Change-Id: I240cd762dc310cc22891985d2044087690b5c6ce
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>