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

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

The shared memory size used by modem and apps for this purpose is 2MB
on msmfalcon.

Change-Id: Id0cdd7f27b42c261966bb5e92d8229fa234445c4
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>