hostap_cs: don't match revisions in presense of the MAC chip name

If the third PCMCIA ID string specifies the MAC chip, the fourth ID
string doesn't need to be matched.  Even if it's different, it will be
compatible with the driver.

This ensures that other different revisions of the card will be
supported.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>