Move orinoco Kconfig entries into drivers/net/wireless/orinoco/Kconfig

Since driver now lives in separate subdirectory, move Kconfig entries
in own file so they can be tweaked indepndently. It complements
"orinoco: Move sources to a subdirectory".

Signed-off-by: Andrey Borzenkov <arvidjaar@mail.ru>
Acked-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>