ARM: dts: msm: GPU IB voting changes for msm8939

Change GPU IB voting values w.r.t. modified BIMC clock plan.

BIMC old values: 166.8MHz, 333.6MHz, 400MHz
BIMC new values: 165.6MHz, 331.2MHz, 398.4MHz

Change-Id: I9fc16aa1f3f4a363e8412d0d0262c8a1a65253a8
Signed-off-by: Ananta Kishore K <akollipa@codeaurora.org>