udev-extraconf: replace bbappend with own recipe

udev-extraconf: replace bbappend with own recipe

Forcing udev-extraconf causes various strange effects. This was
discussed long time ago in oe-core on [1] and resulted in [2].

[1] http://lists.openembedded.org/pipermail/openembedded-core/2013-April/077880.html
[2] http://lists.openembedded.org/pipermail/openembedded-commits/2013-May/148591.html

Signed-off-by: Alexander Shashkevich <alex@stunpix.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>