ARM: dts: msm: Enable midframe sampling timer on SDM630

This change enables midframe sampling timer which samples
the GPU power stats if the command batch expiry takes longer
than the threshold set by KGSL_GOVERNOR_CALL_INTERVAL. This
will help the use cases where long running command batches
were delaying GPU DCVS decision for increasing the frequency.

Change-Id: I41b1dadda348f69d32dd6012a882dbaee20dc691
Signed-off-by: Deepak Kumar <dkumar@codeaurora.org>