defconfig: msm: Enable MSM_TIMER_LEAP for sdm660

Enable MSM_TIMER_LEAP config flag in both sdm660_defconfig
and sdm660-perf_defconfig files. This option enables check
for architecture timer leaps, when all least significant 32bits
of CNTVCT or CNTPCT counter is set and rereads counters.

Change-Id: I643fad053b560e689c9ffd00e1f02790435a9e8c
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>