mhi_dev: mhi: Add DT property for base address, MSI and version

The physical start address of the device over PCIe may
be target specific including the end point MSI and MHI
specification version supported by the device driver.

Change-Id: Ic30c2e6edbf678cec1e64ac02d6b68d33156b114
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>