drivers: edac: Enable llcc ecc interrupt handling

LLCC errors reported as interrupt to gic for single and double errors.
Add support to handle the interrupt and dump the syndrome registers.

Change-Id: Ida9202a3e586e54ad932cf2792fa0ae5963e0a07
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>