ramips: fix devicetree compat strings

ramips: fix devicetree compat strings

"PandoraBox" is not the name of the manufacturer, it's a firmware made by
the manufacturer actually. Their official English name is "D-Team".

PBR-M1 is the only one they use "PandoraBox" as a brand name. Their other
products are using "Newifi" as their trademark (including Y1 and Y1S which
used to be OEM products for Lenovo).

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>