udev: remove bbappend

OE-Core now uses the less-specific touchscreen rule we were applying
here, so we no longer need this.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
meta-handheld: adjust EXTRA_IMAGECMD_jffs2 after oe-core changes

The machine configuration file must specify a customized
EXTRA_IMAGECMD_jffs2 to override the defaults of image_types.bbclass.
Images for NOR flashes should be built with cleanmarkers.

Fix the declaration of padding for collie:
the short form doesn't accept <size> arument

Signed-off-by: Andrea Adami <andrea.adami@gmail.com>