disp: msm: format register/debugbus dumping in logs

Add macros for logging the registers/debugbus, so all blocks
can use the same macros to keep the log format consistent.

Change-Id: Ie28ce83a742f24f3091bedab66c8cf1454bbb943
Signed-off-by: Andhavarapu Karthik <kartkart@codeaurora.org>
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>