bcm63xx: switch to standard nand_do_upgrade

Now that JFFS2 cleanmarkers are supported on the standard nand_do_upgrade
function we can start using it on bcm63xx.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry picked from 60fc3bc9487cbda7092e1b926467b07ea041bc60)

target/linux/bcm63xx/base-files/lib/upgrade/platform.sh

@@ -29,42 +29,6 @@ platform_check_image() {
 	esac
 }
 
-cfe_jffs2_upgrade_tar() {
-	local tar_file="$1"
-	local kernel_mtd="$(find_mtd_index $CI_KERNPART)"
-
-	if [ -z "$kernel_mtd" ]; then
-		echo "$CI_KERNPART partition not found"
-		return 1
-	fi
-
-	local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
-	board_dir=${board_dir%/}
-
-	local kernel_length=$(tar xf $tar_file ${board_dir}/kernel -O | wc -c 2> /dev/null)
-	local rootfs_length=$(tar xf $tar_file ${board_dir}/root -O | wc -c 2> /dev/null)
-
-	if [ "$kernel_length" = 0 ]; then
-		echo "kernel cannot be empty"
-		return 1
-	fi
-
-	flash_erase -j /dev/mtd${kernel_mtd} 0 0
-	tar xf $tar_file ${board_dir}/kernel -O | nandwrite /dev/mtd${kernel_mtd} -
-
-	local rootfs_type="$(identify_tar "$tar_file" ${board_dir}/root)"
-
-	nand_upgrade_prepare_ubi "$rootfs_length" "$rootfs_type" "0" "0"
-
-	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
-
-	local root_ubivol="$(nand_find_volume $ubidev $CI_ROOTPART)"
-	tar xf $tar_file ${board_dir}/root -O | \
-		ubiupdatevol /dev/$root_ubivol -s $rootfs_length -
-
-	nand_do_upgrade_success
-}
-
 platform_do_upgrade() {
 	case "$(board_name)" in
 		comtrend,vg-8050|\
@@ -72,7 +36,8 @@ platform_do_upgrade() {
 		huawei,hg253s-v2|\
 		netgear,dgnd3700-v2)
 			REQUIRE_IMAGE_METADATA=1
-			cfe_jffs2_upgrade_tar "$1"
+			CI_JFFS2_CLEAN_MARKERS=1
+			nand_do_upgrade "$1"
 			;;
 		sercomm,ad1018|\
 		sercomm,h500-s-lowi|\