arm64: Remove ECC check in do_bad on SDM845

In previous targets, we would check for ECC errors on do_bad case as
there were forms of ECC that did not generate interrupts. On SDM845 as
all forms of ECC raise an interrupt, we no longer need to make the check.

Change-Id: I406b93f09fd9ce250584c019e9600c2412c935cc
Signed-off-by: Kyle Yan <kyan@codeaurora.org>