coresight-tpdm: Add support to dump MCMB MSR

Add support to dump MSR for MCMB TPDM. This is needed
for postprocessing of dump data obtained from MCMB source.

Change-Id: Iddcd6dba98463ddf5e1df66378ba2645ee53c644
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>
Signed-off-by: Saranya Chidura <schidura@codeaurora.org>