arm64: Check for parity errors on synchronous aborts

Certain types of fatal synchronous aborts may be triggered by parity
errors in the L1 or L2 caches. Check whether a parity error occured and
print out the relevant information.

Change-Id: Ibc306e12e95286d29757bac293bd0b69bf04ebc4
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>