brcm2708: partially revert r46347 to fix sysupgrade

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46367 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/brcm2708/image/Makefile

@@ -40,9 +40,6 @@ endef
 define Build/sdcard-img
 	./gen_rpi_sdcard_img.sh $@ $@.boot $(word 2,$^) \
 		$(CONFIG_BRCM2708_SD_BOOT_PARTSIZE) $(CONFIG_TARGET_ROOTFS_PARTSIZE)
-  ifneq ($(CONFIG_TARGET_IMAGES_GZIP),)
-	gzip -k -f9 $(BIN_DIR)/$(IMG_PREFIX)-sdcard-vfat-$(1).img
-  endif
 endef
 
 ### Device macros ###