maintainers.inc: unassign myself (don't panic!)

maintainers.inc: unassign myself (don't panic!)

For a very long time my focus hasn't been these recipes
in particular; rather I'm trying to ensure oe-core as a whole
doesn't fall too far behind upstream releases. To better reflect
this reality, I wish to be no longer listed for any specific
recipes.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>