msm: ADSPRPC: Dump remote heap buffer area

As part of subsystem restart handler, dump the remote heap
segment when the dump collection is enabled.

Change-Id: Ib0a8d6a3d68e0f8102ea72c6866c5b50286536f8
Acked-by: Himateja Reddy <hmreddy@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>