drivers: edac: Enable and use per-cpu variable for l1/l2 IRQ

Requesting PPI does not automatically enable the interrupt. Extra
call to enable PPI is required. Also add a per-cpu drvdata as
request_percpu_irq expects a per-cpu dev_id to pass back to the
interrupt handler.

Change-Id: I09b40b8ab703ce1cf420733cf9de411650bf707d
Signed-off-by: Kyle Yan <kyan@codeaurora.org>