It's expected the mkits.sh script to generate only the relevant DTS
entry and have all the blob already prepared to use for mkimage.
This is not the case for the RootFS case where the script generates a
.pagesync with the dd command.
To better handle this, drop the dd command and instead error out if the
.pagesync blob is not found if RootFS is used.
Adapt the generic fit build in image-commands.mk to call the dd for
.pagesync right before mkits.sh.
Link: https://github.com/openwrt/openwrt/pull/20492
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
