misc: fastrpc: Add dma handle implementation

The remote arguments carry both remote buffers and dma handles. Add proper
dma handle instructions to make it compatible with DSP implementation.

Signed-off-by: Vamsi Krishna Gattupalli <quic_vgattupa@quicinc.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>