defconfig: msm: enable MSM_TIMER_LEAP config

There is potential rollover condition for CNTVCT and
CNTPCT counters.enable the config to control the counter read
to avoid rollover.

Change-Id: I6e3430e6ffe631d175d560fbcf0e4cee46ff7715
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>