zd1211rw: Please revert commit

Hi John,

A user reported that commit 4e1bbd846d00a245dcf78b6b331d8a9afed8e6d7 
(Remove unneeded packed attributes) breaks the zd1211rw driver on ARM. 
Please revert it for 2.6.19, we may attempt this change again at a later 
date.

Thanks,
Daniel