defconfig: 8994: Enable panic on correctable errors

Panic the kernel if a correctable cache error is detected,
since even correctable errors may be indicative of a
marginal system state, implying that the system cannot be
trusted.

Change-Id: I47b23eb6d97412db1d499410f368f4ad92e8b14c
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>