msm: mdss: debug: reduce default logging when xlog handler is called

During fatal errors, XLOG handler is called which dumps certain
information, address, debug bus, xlog etc., into kernel logs and
other larger information, register dumps, into RAM. Remove debug bus
dumping from kernel logs to RAM and reduce information dumped into
kernel logs to minimal in order to prevent watch-dog bites.

Change-Id: Id21b1eae156ec37f8c0bf42bd51ecbff29d0ab8d
Signed-off-by: Ujwal Patel <ujwalp@codeaurora.org>