regulator: cpr-regulator: Add a per cpr corner to mem-acc corner map

Define an array to map the CPR corner to MEM ACC corner. This allows
finer ACC configuration for individual corners. This is an optional
mapping provided through the device node. If not specified, the
fuse-corners are mapped as acc corners.

Change-Id: I260d4a906e0b16bacc9e724dd910c0afbe97925c
Signed-off-by: Ravindranath Thiyagarajan <rthiyaga@codeaurora.org>