[SCSI] advansys: Convert to EISA driver model

 - Switch EISA probing to the driver model
 - Remove some now-unused macros and functions
 - Update the FIXME now that we use the correct driver model probing API

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>