Revert "tty: serial: qcom_geni_serial: Use OPP API to set clk/perf state"

This reverts commit 3d9231e6

Rajendra writes:

	Greg, there are other patches in the series which have a
	dependency on this patch [1] would it be possible for you to
	drop this patch and instead ack it so it can be taken via the
	msm tree?

So dropping it from here.

Reported-by: Rajendra Nayak <rnayak@codeaurora.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Akash Asthana <akashast@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>