Change OpenWRT imported dtsi files

Change OpenWRT imported dtsi files

Change '#include <fbsd-*>' to '/include/ "fbsd-*"' in [rm]t*.dtsi

Basically the pre-import work on OpenWRT's dts/dtsi files boils down to:

for f in `ls [mr]t*.dtsi`; do
printf '\n/include/ "fbsd-$f"\n' >> $f
done

Approved by:	adrian (mentor)
Sponsored by:	Smartcom - Bulgaria AD
Differential Revision:	https://reviews.freebsd.org/D5993