msm: clock-8610: Allow measurement of clocks in the WCNSS

For debugging reasons, it is required that WLAN drivers
be able to measure clocks in the WCNSS subsystem. It is
assumed that the WCNSS debug mux is already programmed
by the WCNSS firmware.

Change-Id: If3ebbe680347aa62d6c706f1518dda4585b90a74
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>