uboot-mediatek: fix board name of Bananapi BPi-R2

As the board name was changed to be identical to the device tree
compatible string (just like for other boards), also reflect that
change for U-Boot.

Signed-off-by: Daniel Golle <[email protected]>

package/boot/uboot-mediatek/Makefile

@@ -85,7 +85,7 @@ endef
 
 define U-Boot/mt7623n_bpir2
   NAME:=Banana Pi R2 (mt7623)
-  BUILD_DEVICES:=bpi_bananapi-r2
+  BUILD_DEVICES:=bananapi_bpi-r2
   BUILD_SUBTARGET:=mt7623
   UBOOT_IMAGE:=u-boot.bin
   UBOOT_CONFIG:=mt7623n_bpir2