ARM: dts: msm: update rmtfs shared memory address for SDM660/630

Use reserved memory as shared memory between apps and modem for
writing modem data using rmt_storage service on apps.

Change-Id: I0e5bc8b1e3dbe2f8d49686894667b4a6ee1a3529
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>