ARM: dts: msm: Lower Venus Decoder bandwidth values on 8084

The apq8084 decoder bandwidth numbers previously mirrored the slightly
higher IB that we used on 8974.  Instead, use the suggested bandwidth
values for 8084.

CRs-Fixed: 657690
Change-Id: I8b21cf84a9aa36b573221c8caebb8199a122286e
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>