ramips: fix RBM33G name

The device name is corrected to match the hardware-stored (in hard config
flash space) device name.

Tested-by: Tobias Schramm <tobleminer@gmail.com>
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>

target/linux/ramips/dts/RBM33G.dts

@@ -7,7 +7,7 @@
 
 / {
 	compatible = "mikrotik,rbm33g", "mediatek,mt7621-soc";
-	model = "MikroTik RBM33G";
+	model = "MikroTik RouterBOARD M33G";
 
 	aliases {
 		led-status = &led_usr;