[PATCH] zd1211rw: Support AL7230B RF

This patch adds support for another Airoha RF which is present in some
ZD1211 adapters. This RF supports 802.11a as well as 802.11b/g, but 802.11a
connectivity is not yet supported by this driver.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>