msm: Add support to dump the caches on panic

During the normal course of panic, caches are flushed.
In most regular cases, this behavior is fine. If the
cache itself is suspect, it is important to store whatever
data is there before restart. A suspect cache may manifest
as a kernel panic due to an abort. Dump the caches during
the panic code path to save for analysis later.

Change-Id: Iaa7194027f2f589a60bfade896cd455eb4cc8989
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>