defconfig: fsm9900: Enable panic on L2 errors

This option was temporary disabled to allow
softwre development to continue. The issue behind
the present L2 error is resolved. Enable panic to
catch other L2 errors in future.

Change-Id: I48b8c5f3d838821ebd604a66e3a9d292a4b082ca
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>