b44: Use pr_<level>_once and DRV_DESCRIPTION

Convert a printk with a static to pr_<level>_once
Add and use DRV_DESCRIPTION to reduce string duplication.
Remove now unused version.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>