ARM: dts: msm: Add remote fs device node on sdm855

It is needed to enable remote file system on modem processor, which
needs access to store data onto eMMC/UFS device.

Change-Id: I59caf00fbf9218c9da114e2856719b982088266a
Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>