pimlico: remove Poky overrides

There was a poky distro override to enable the "owl" window menu functionality.
As these packages are in meta-oe now and only Sato/poky supported owl, remove
the override and patches.

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>