multilib.bbclass: replace deprecated e.data with d

Replace deprecated e.data with d in multilib.bbclass and
multilib_global.bbclass.

Remove event check in function multilib_virtclass_handler_vendor in
multilib_global.bbclass. The function flag 'eventmask' has been set
with 'bb.event.ConfigParsed', so no need to check the event any more.

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>