msm: ADSPRPC: Remove references to SMD

SMD is being removed from defconfig of SDM660. All the references
to SMD like macros and header files are removed from fastrpc driver.

Change-Id: Iaa961e7faee4b59562fc92133c5154027c325f53
Acked-by: Vishnu Karthik <vikarthi@qti.qualcomm.com>
Signed-off-by: Sathish Ambley <sathishambley@codeaurora.org>