mwl8k: rename 2.4 GHz band/channels/rates related variables from FOO to FOO_24

To prepare for adding 5 GHz band/channels/rates.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed