ZD1211 appears to be back in production: a number of new devices have
been appearing! Some of them are using new radios.

This patch adds support for the next generation AL2230 RF chip which has
been spotted in a few new devices.
Signed-off-by: NDaniel Drake <dsd@gentoo.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>