ARM: dts: msm8909: Get bus utilization factor at run time

The bus utilization factor can vary based on chipset. The value
needs to be represented in Q10 format and will be used to compute
the bandwidth requests.

Change-Id: Ia29a3038b58a4cdd467ee5c6b7eaf6d0d66a6879
Signed-off-by: Venu Yeshala <vyeshala@codeaurora.org>