ARM: dts: msm: enable dma-coherent attribute for UFS on SM8150

Bootloader enable the IO coherency for UFS controller hence we can
make UFS as dma-coherent in kernel to skip unnecessary cache maintenance
operations.

Change-Id: I33c685ba17f5656c9fff765f4539a67e269efa0b
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>