soc: qcom: Add power register dump entry id for memory dump

Add new client "power register dump" entry id for the memory dump table,
this is used for lmh, rsc and pdc register dumps on system crash.

Change-Id: Ie10f0a7a86c05fc1d3bb90a8d08f0033a552a154
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>