msm: clock-8974: Remove control of mmssnoc_bto clock

The mmssnoc_bto clock is used to monitor ahb timeouts. However, since
there is no linux client driver, this clock will be automatically
disabled. To prevent this, remove the clock entry.

Change-Id: I706d8c8297bac5b85f4997079d3b649264730629
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>