ARM: dts: msm: Configure cx ipeak for video for sm6150 and sdmmagpie

The cx ipeak configuration provides the threshold frequency. Video
driver updates a register to notify about it being running at or
beyond the threshold frequency.

Change-Id: If716de3ee865698c0aa20c24ae9189d51d3bbedf
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>