ARM64: Add snapshot of edac.h from msm-3.10

Sync the ARM64 edac header to the version found in msm-3.10
as of commit 142c36711024877a2ec1eb13dbbca38503b26ee3 ("edac:
cortex_arm64_edac: Use dbe irq only") to bring in external
EDAC API definitions that were missed during the msm-3.18
upgrade.

Change-Id: If2dc53858d7a30086a95ea5047bd6b18e44f7e09
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>