ARM: dts: msm: Reduce HS200 SDC1 frequency for MSM8974Pro AC MTP

The eMMC spec defines 200MHz as the absolute max supported frequency for
HS200 mode. To provide a jitter free clock that meets the spec clock
plan has been updated to support a max frequency of 192MHz for HS200,
hence update the SDC1 supported clocks table to reflect that.

Change-Id: I102fa610a10b93d375a565e7beed45ef635a4a67
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>