ARM: dts: msm: Vote for nominal bus frequencies for 8916

Currently USB driver is voting for maximum PCNOC frequency which
results in CX running at turbo and could cause thermal issues.
Hence vote for nominal bus frequencies for USB to DDR path
which help in avoiding thermal issues with USB connected and
also keeping USB performace numbers same as PNOC running at max
value.

CRs-Fixed: 722888
Change-Id: I25471aa48e29dfe68f2444a61384e89f9d04c87c
Signed-off-by: Sujeet Kumar <ksujeet@codeaurora.org>