clk: qcom: Move clock debug measure support from common code

The 'measure' functionality is a debug feature which allows the user of
clocks to allow measuring the frequency of a given clock using the ring
oscillator.
Move 'measure' code to a new clk-debug file to support the functionality.

Change-Id: I229721f17d232a4ff69b5cf416b43d22fee5b72e
Signed-off-by: Taniya Das <tdas@codeaurora.org>