ARM: dts: msm: Add non-removable ufs property for sdm670

Defines the non-removable property for UFS device node.
This basically lets the driver know that UFS is the boot
device.

Change-Id: I7761f92c05cbbc66e27c59a7e9254d481d5d1932
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>