wifi: remove orphaned ray_cs driver

Aviator/Raytheon is an early PCMCIA driver, apparently predating 802.11b
and only supporting wireless extensions.

The driver has been orphaned since 2010 and only seen cosmetic updates
long before than. Jean Tourrilhes pointed out in a 2005 changelog that
he tested a change on actual hardware, which was apparently already
noteworthy back then.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kalle Valo <kvalo@kernel.org>