CRYPTO is a helper variable, and to make it easier for users, it should
therefore select'ed and not be listed in the dependencies.

drivers/net/wireless/airo.c requires CONFIG_CRYPTO for compilations.

Therefore, AIRO_CS also has to CRYPTO.

Additionally, this patch removes the #ifdef's for the non-compiling
CRYPTO=n case from drivers/net/wireless/airo.c.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>