ARM: dts: msm: Add IMEM entries and restart node for mdmfermium

Add imem entries for bootstats and pil. Add the restart
device node used by the msm poweroff driver to drop ps
hold and reset the chip.

Change-Id: Ibd4ca4ce01c6ab85f40622f59c3ed52f3b1977da
Signed-off-by: Venkatesh Yadav Abbarapu <vabbar@codeaurora.org>