clk: qcom: clk-debug: Unflatten mux tree

In order to circumvent the 256 parent limit allowed per clock
and more accurately represent the mux topology, separate out
each clock to their respective debug muxes and update the supporting
functions that configure these muxes for measurement.

Change-Id: I63e3a4565a61997757c375d2ebb1d01e82a37814
Signed-off-by: David Dai <daidavid1@codeaurora.org>