GPLv2/GPLv3 logic is now handled via the agl-gplv2 feature, so stop
always adding meta-gplv2 for the agl-demo feature. agl-demo will need to
work with both GPLv2 and GPLv3 recipes, as different users will have
different requirements with regard to GPL versioning.
Depends-On: I62d7f2daa58b0690b5b27740257bd15097fcee5c
Change-Id: I2a4119f856ba78b2e718044d8095ed168a70f47f
Signed-off-by: Martin Kelly <mkelly@xevo.com>