msm: msm_bus: Fix bus scaling tracing compile time error

Move the bus scaling trace file to a non-architecture specific
location since the bus scaling device driver is compiled on
multiple architectures.

Change-Id: Ia39818aa18a35e2ccb1780db0149789439c3d391
Signed-off-by: Dan Sneddon <dsneddon@codeaurora.org>