Revert "usb: add HAS_IOMEM dependency to USB_APPLEDISPLAY"

This reverts commit 4b61b4f2.

As reported by Oliver, this change was unnecessary.

Reported-by: Oliver Neukum <oneukum@suse.com>
Cc: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>