msm: cache_erp: Add device tree support

Add device tree bindings and driver support for the cache
error reporting devices on 8974. Remove leftover
opportunistic debug info from the L1 error handler, since
we can no longer get away with this on all targets.

Change-Id: Iac88915a6b40a40ec3157027048f4daf6369dc42
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>