mips: dts: ralink: mt7621: rename to GnuBee GB-PC1 and GnuBee GB-PC2

Rename GB-PC1 to GnuBee GB-PC1, and GB-PC2 to GnuBee GB-PC2 to include
brand and model name.
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Acked-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/boot/dts/ralink/mt7621-gnubee-gb-pc1.dts

@@ -8,7 +8,7 @@
 
 / {
 	compatible = "gnubee,gb-pc1", "mediatek,mt7621-soc";
-	model = "GB-PC1";
+	model = "GnuBee GB-PC1";
 
 	memory@0 {
 		device_type = "memory";

arch/mips/boot/dts/ralink/mt7621-gnubee-gb-pc2.dts

@@ -8,7 +8,7 @@
 
 / {
 	compatible = "gnubee,gb-pc2", "mediatek,mt7621-soc";
-	model = "GB-PC2";
+	model = "GnuBee GB-PC2";
 
 	memory@0 {
 		device_type = "memory";