Boot to your XP cdrom into the setup mode, once there go into your VM settings and set your floppy to use existing floppy image in datastore and browse to the following path [] /vmimages/floppies/ and select the vmscsi-1.2.0.2.flp. When your XP setup screen gets to the point where you are allowed to specify additional drivers for the controller you can hit F6 and it should allow you to select a driver for the controller.
It's been awhile since I did that but I think I got all the steps.
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