ARM: dts: msm: Add non-removable ufs property for sdm845

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

Change-Id: I76504137065b79b7658ba68235551674d82b56f9
Signed-off-by: Sayali Lokhande <sayalil@codeaurora.org>