defconfig: enable ADSP RPC driver for qcs405

Configure ADSP RPC driver, which provide a communication
mechanism that allows for clients to make remote method
invocations across processor boundary to applications
DSP processor.

Change-Id: I57fef3c8c80b5c03df83093cdac5d7a02c5c96fa
Acked-by: Chenna Kesava Raju <chennak@qti.qualcomm.com>
Signed-off-by: Tharun Kumar Merugu <mtharu@codeaurora.org>