O> This driver dooen't even use DMA mode so warning about forcing the setting

may be puzzling.  In addition we do the same thing cs5520_reinit_one()
but without warning the user this time.  Thus removal of the warning makes
it easier for *_reinit_one() replacement by ->init_host method later
(patch is ready for this).

The re-init case won't find it mis-set. And the CS5520 is not a normal
controller even for DMA so I'd prefer it left as is.