drivers: lmh_dcvsh: Provide CPU frequency in Hz for opp interface

The frequency requested by LMH DCVSh hardware may not match an actual
frequency in the CPU clock plan. LMH DCVSh driver uses OPP framework to
match the hardware frequency request to a nearest valid CPU frequency. OPP
interface expects the frequency input in Hz and DCVSh driver is passing the
frequency value in kHz, which will result in error. So the hardware
mitigation frequency reported by the driver may not reflect the actual
frequency that the CPU is mitigated to.

Provide the hardware frequency input in Hz for OPP interface in LMH DCVSh
driver. Hardware mitigation frequency can be lower than the lowest
possible CPU frequency. In that case freq floor call will fail. So call
dev_pm_opp_find_freq_ceil to match to the lowest CPU frequency.

Change-Id: I6e9f7f5129320c37d41e20ca9735129f25440134
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>

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