defconfig: fsm9900: Temporarily disable panic on L2 errors

A panic due to  L2 master port decode error is halting the FSM9900 kernel.
The root cause is being analyzed and proper fix is worked on. This
temporary change will enable software development on the target.

Change-Id: I0d8d420f60add101e2a96f99e786b38a7b2f5a97
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>