imx6: apalis: add missing jffs2reset to ramfs during sysupgrade

jffs2reset is used to cleanup the rootfs_data overlay, but it's
currently missing in the ramfs during sysupgrade leading to the
following error:

 Switching to ramdisk...
 Performing system upgrade...
 /lib/upgrade/do_stage2: line 27: jffs2reset: not found

Fixes: 2f1a11d008 ("imx6: apalis: fix config survival after sysupgrade -n")
Signed-off-by: Petr Štetiar <ynezz@true.cz>

target/linux/imx6/base-files/lib/upgrade/platform.sh

@@ -4,7 +4,7 @@
 
 . /lib/imx6.sh
 
-RAMFS_COPY_BIN='blkid'
+RAMFS_COPY_BIN='blkid jffs2reset'
 
 enable_image_metadata_check() {
 	case "$(board_name)" in