ramips: remove unnecessary DEVICE_PACKAGES for Belkin F7C027

kmod-usb-dwc2 and kmod-usb-ledtrig-usbport are not target default packages, and
Belkin F7C027 does not have a USB port anyway. Just drop it.

Signed-off-by: Sungbo Eo <[email protected]>

target/linux/ramips/image/rt305x.mk

@@ -298,7 +298,6 @@ define Device/belkin_f7c027
   IMAGE_SIZE := 7616k
   DEVICE_VENDOR := Belkin
   DEVICE_MODEL := F7C027
-  DEVICE_PACKAGES := --kmod-usb-dwc2 -kmod-usb-ledtrig-usbport
   SUPPORTED_DEVICES += f7c027
 endef
 TARGET_DEVICES += belkin_f7c027