powerpc/fsl-booke: Handle L1 D-cache parity error correctly on e500mc
If the L1 D-Cache is in write shadow mode the HW will auto-recover the
error. However we might still log the error and cause a machine check
(if L1CSR0[CPE] - Cache error checking enable). We should only treat
the non-write shadow case as non-recoverable.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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