meta-yocto: Drop meta-yocto directory

This was only present for transition purposes at upgrade, drop it
since its been present for several releases now.

(From meta-yocto rev: 8387f03c0071749e031e573f01b8e54cd3a01466)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-yocto/conf/layer.conf

@@ -1,2 +0,0 @@
-# Dummy file to allow for meta-yocto -> meta-poky transition
-BBPATH =. "${LAYERDIR}/../meta-poky:"