defconfig: fsm9900: Disable CONFIG_MSM_IPC_ROUTER_SMD_XPRT

Disable the SMD path for IPC_RTR since early release of FSM9900
will support only the apps processor.

Change-Id: I70fb979d3c887f31ecb025e19b7221592267b288
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>