Remove weston-ivi-extension recipe files, as they are being moved to
the meta-agl-profile-graphical layer in the meta-agl repository. This
allows using weston-ivi-extension in images other than
agl-demo-platform.
Bug-AGL: SPEC-1730
Change-Id: I31af55b4b0a6233b955688f888b42c4861385188 Signed-off-by: Scott Murray <scott.murray@konsulko.com>