msm: ADSPRPC: Bail out on dma allocation failure

Bail out immediately on dma memory allocation failure
and free the maps.

Change-Id: I36f7fd298876ad927a15ea0cb83308b35a1044e5
Acked-by: Himateja Reddy <hmreddy@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>