seeq: fix compile breakage on s390

The SEEQ drivers should depend on HAS_IOMEM to prevent compile breakage
on !HAS_IOMEM architectures:

drivers/net/ethernet/seeq/seeq8005.c: In function 'seeq8005_probe1':
drivers/net/ethernet/seeq/seeq8005.c:179:2: error:
  implicit declaration of function 'inw' [-Werror=implicit-function-declaration]

Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>