msm: clock-8226: 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: I3e7411021200a96454f37a1d40a17b109be4fc70
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>