net: let KS8842 driver depend on HAS_IOMEM

Fixes this compile error on s390:

  CC      drivers/net/ks8842.o
drivers/net/ks8842.c: In function 'ks8842_select_bank':
drivers/net/ks8842.c:124: error: implicit declaration of function 'iowrite16'
drivers/net/ks8842.c: In function 'ks8842_write8':
drivers/net/ks8842.c:131: error: implicit declaration of function 'iowrite8'

Cc: Richard Rojfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 01f282cd0989..dd145c1714a4 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1725,6 +1725,7 @@ config TLAN
 
 config KS8842
         tristate "Micrel KSZ8842"
+        depends on HAS_IOMEM
         help
           This platform driver is for Micrel KSZ8842 chip.