mwl8k: firmware command code cleanup

Sort firmware commands by command code, get rid of the 802_11 substring
in all command names, and make sure that the command functions match the
firmware command names.

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