cfg80211: force last_request to be set for OLD_REG if regdom is EU

Although EU is a bogus alpha2 we need to process the send request
as our code depends on last_request being set.

Cc: stable@kernel.org
Reported-by: Quentin Armitage <Quentin@armitage.org.uk>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>