ARM: dts: msm: mhi: Added dts entry for MHI

Added dts entry for MHI driver. MHI needs access
to platform specific resources to enable correct
operation.

Change-Id: Ife54e62a942afb85a9935bda07535e1e65811a86
Signed-off-by: Andrei Danaila <adanaila@codeaurora.org>