soc: qcom: add support for per cluster scan dumps

Add support to allocate memory for per cluster scan dumps.
This memory can be used to save CPU scan dumps at the time
of a dump.

Change-Id: I29dffb2ffe6ae6ae59f4bc91deb996e5bf512b10
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>
[mojha@codeaurora.org: Added logic to handle both single
and per core scandump buffer]
Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>