tegra: pad rootfs to recreate overlay after upgrade

The old overlay remained after upgrades and would cause failure on first
boot after upgrade, in which no new overlay could be created while old
one was unusable.

Signed-off-by: Tomasz Maciej Nowak <[email protected]>

target/linux/tegra/image/Makefile

@@ -16,12 +16,13 @@ define Build/tegra-sdcard
 		-n '$(DEVICE_TITLE) OpenWrt bootscript' \
 		-d $(BOOT_SCRIPT) \
 		[email protected]/boot.scr
+	$(CP) $@ [email protected]
 
 	SIGNATURE="$(IMG_PART_SIGNATURE)" \
 	$(SCRIPT_DIR)/gen_image_generic.sh \
 		$@ \
 		$(CONFIG_TARGET_KERNEL_PARTSIZE) [email protected] \
-		$(CONFIG_TARGET_ROOTFS_PARTSIZE) $(IMAGE_ROOTFS) \
+		$(CONFIG_TARGET_ROOTFS_PARTSIZE) $@.rootfs \
 		2048
 
 	$(if $(UBOOT),dd if=$(STAGING_DIR_IMAGE)/$(UBOOT).img of=$@ bs=512 skip=1 seek=1 conv=notrunc)
@@ -32,7 +33,7 @@ DEVICE_VARS += BOOT_SCRIPT UBOOT
 define Device/Default
   BOOT_SCRIPT := generic-bootscript
   IMAGES := sdcard.img.gz
-  IMAGE/sdcard.img.gz := tegra-sdcard | gzip | append-metadata
+  IMAGE/sdcard.img.gz := append-rootfs | pad-extra 128k | tegra-sdcard | gzip | append-metadata
   KERNEL_NAME := zImage
   KERNEL := kernel-bin
   PROFILES := Default