msm: ADSPRPC: Enable ADSP remote heap

Enable dynamically growing and shrinking of ADSP heap
by allocating memory from Apps and locking the memory
to prevent Apps from being able to access the memory
while its in use by ADSP.

Change-Id: I7a05751c69b569ce3f1712c4bb1c941ab47c8174
Acked-by: Bharath Kumar <bkumar@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>