defconfig: msm: disable DEBUG_SPINLOCK

The current spinlock lockup detection code can sometimes
produce false positives on some platform, because of the
unfairness of the locking algorithm itself, so we disable
DEBUG_SPINLOCK.

Change-Id: Ic909d2aac3f669c5324bfe32ece66d3d9d1c6db9
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>