ARM: dts: msm: Enable MHI device for mdmcalifornium

Modem Host Interface (MHI) is used by clients to
communicate between device and host. Software and
hardware channels communicate over IPA DMA.

Change-Id: I84241ac8ce4d0562d770725f884fd346c44a44d5
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>