defconfig: 8610: Enable ADSP RPC driver

The ADSP RPC driver allows for clients to make remote method
invocations across processor boundary to DSP processor. Enable
this driver for MSM8610.

Change-Id: Iee26e2e44492e6da2a24f242c23fa9daebd58033
Acked-by: Sathish Ambley <sambley@qti.qualcomm.com>
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>