devfreq: devfreq_simple_dev: Add support for preparing device clock
For certain implementation, device clock needs to be prepared before
rate voting taking effect. Add support for preparing device clock
during initialization.
Change-Id: Ib22e83952187118342ff2546d4c79d3970a288f9
Signed-off-by:
Junjie Wu <junjiew@codeaurora.org>
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