On the MSM Copper, the RPM processor does not support the ability to query the state of a resource. Return the cached rate in the clock struct instead of attempting to query the RPM. This will also allow debugfs to become useful again for RPM clocks. Change-Id: If3e0cde516a96130ac63b5e6b832852940fe5764 Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>