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In order to reduce BOM cost and board area for imaging solution, the sensor requires a 19.2/24MHz reference clock from PCH. In addition to that, having PCH to supply the sensor reference clock will prevent dependency on CPU power management and also avoid level shifter cost. Pch iSCLK is only required for CNP-LP with the camera sensor on the platform. BUG=None TEST=Boot up into OS and read back PCH iSCLK programming through iotools. Change-Id: I28c97a75f2a7f5122a20c8b8f0f2671037a7eca6 Signed-off-by: Lijian Zhao <lijian.zhao@intel.com> Reviewed-on: https://review.coreboot.org/23367 Reviewed-by: Furquan Shaikh <furquan@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>