soc: qcom: Add entry removal support for Minidump

Some DLKM drivers can register its region with minidump
table. If the driver want to unload, then it should remove
the registered region in the minidump table.
So add the support to remove requested region.

Change-Id: If0f395516b45e9d7124a49763078f6dac4f50cda
Signed-off-by: Lingutla Chandrasekhar <clingutla@codeaurora.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>