drm/msm: add crash analysis for important debug registers

Add hooks to read and parse important SDE hardware debug
registers at the time of doing a debug register dump to provide
a first pass of analysis in the logs.

Change-Id: I06b54d29dd0cda610f095f57d5cf3069eb9e9dba
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>