Amlogic: mkimage: do not configure extlinux for box

projects/Amlogic/bootloader/mkimage

@@ -3,8 +3,6 @@
 
 . config/options ""
 
-DTB="$(${SCRIPTS}/uboot_helper ${PROJECT} ${DEVICE} ${UBOOT_SYSTEM} dtb)"
-
 mkimage_uboot(){
   echo "image: writing u-boot to $(basename $DISK)"
   dd if="$INSTALL/usr/share/bootloader/u-boot.bin.sd.bin" of="$DISK" conv=fsync,notrunc bs=1 count=444 >"$SAVE_ERROR" 2>&1 || show_error

scripts/uboot_helper

@@ -133,7 +133,7 @@ devices = \
   'Amlogic': {
     'AMLGX': {
       'box': {
-        'dtb': 'meson-gxl-s905x-p212.dtb',
+        'dtb': '',
         'config': 'p212_defconfig'
       },
       'lepotato': {
@@ -151,7 +151,7 @@ devices = \
     },
     'AMLG12': {
       'box': {
-        'dtb': 'meson-g12a-x96max.dtb',
+        'dtb': '',
         'config': 'p212_defconfig'
       },
       'odroid-n2': {