brcm2708: remove duplicated gzip from image generation

Images are now automatically gziped so remove custom image command

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/brcm2708/image/Makefile

@@ -44,7 +44,6 @@ endef
 define Build/sdcard-img
 	./gen_rpi_sdcard_img.sh $@ [email protected] $(IMAGE_ROOTFS) \
 		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
-	$(if $(CONFIG_TARGET_IMAGES_GZIP),gzip -9n -c $@ > $(BIN_DIR)/$(notdir $@).gz)
 endef
 
 ### Devices ###