defconfig: msm: Enable RCU_PANIC_ON_STALL

Panic on RCU stall instead of just printing the RCU stall warning. This
helps in saving the CPU context as part of ramdumps and helps in
debugging issues related to RCU stalls.

Change-Id: Ie26b148ce5b34a861490628410bd3c58d139d553
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>