edac: cortex: Snapshot arm64 cortex-a cpu edac driver

This is a snapshot of arm64 cortex-a cpu edac driver from
msm-4.14 commit cd6d26aaaecf (edac: cortex: Snapshot arm64
cortex-a cpu edac driver).

Change-Id: Ic84ceb52114947f17fc6d0fac87039d4b450f70a
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
[snaseem@codeaurora.org: Resolved restriction errors.]
Signed-off-by: Shadab Naseem <snaseem@codeaurora.org>