ARM: dts: msm: Add CPU EDAC device for MSM8994

Add the device tree entry to enable support for the error
reporting features of the CCI and the Cortex A53/A57 CPUs,
to facilitate debugging of system-level stability problems.

Change-Id: I3cad36f3b71943cf6edbfd5142ab62e07a8cecf1
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>