defconfig: fsm9900: Disable irsc security and smd tty

These features are not supported in fsm9900.

Change-Id: Ic0ad85dac6728717b3ee553851a24bfedcc67aef
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>