ramips: mt7620: dwr92x: add 464xlat pkg

Add package 464xlat to fix error
"Failed to load config file: : Parse error (invalid command) at line 59, byte 1"
when restart the lte with IPv6 configuration.

Signed-off-by: Giuseppe Lippolis <giu.lippolis@gmail.com>

Author: fid0did0

target/linux/ramips/image/mt7620.mk

@@ -318,7 +318,7 @@ define Device/dlink_dwr-921-c1
   DLINK_ROM_ID := DLK6E2414001
   DLINK_FAMILY_MEMBER := 0x6E24
   DLINK_FIRMWARE_SIZE := 0xFE0000
-  DEVICE_PACKAGES += kmod-usb-net-qmi-wwan kmod-usb-serial-option uqmi
+  DEVICE_PACKAGES += kmod-usb-net-qmi-wwan kmod-usb-serial-option uqmi 464xlat
 endef
 TARGET_DEVICES += dlink_dwr-921-c1