ARM: dts: msm: Modify BIMC nominal clock rate for msm8939

As part of clock plan change, new BIMC nominal
clock rate is at 331.2 MHz. Previous clock rate
is leading BIMC to Turbo inturn causing higher
power consumption. Modify this voting as per
nominal clock plan.

CRs-Fixed: 747078
Change-Id: Ib0a38287eccec37e913e2f1271ae258f5fe44170
Signed-off-by: Sujeet Kumar <ksujeet@codeaurora.org>