ARM: dts: update ufs slave bus voting IB for SM8150

During UFS read/write test, UFS slave interface (clocked by CNOC clock)
stays at 19.2MHz even during heavy UFS data traffic. UFS random read/write
numbers suffer as CNOC clock isn't running at peak frequency.
During peak UFS traffic, UFS slave interface clock is expected to be
clocked at peak frequency.
This change updated the bus voting instanenous bandwidth (IB) value for UFS
slave in order to scale up CNOC clock to 75MHz when UFS interface is
operating at peak speed (HS Gear3 Rate-B 2-lane mode).

Change-Id: Id88f22780ae4893acee9e7adbb38427572bdf7f5
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>