LIBERTAS_CS: ioport_map/unmap relies on HAS_IOPORT_MAP

Fixing following sh-allmodconfig errors reported on kisskb

"
drivers/net/wireless/libertas/if_cs.c:826:3: error: implicit declaration of function 'ioport_unmap' [-Werror=implicit-function-declaration]
drivers/net/wireless/libertas/if_cs.c:878:2: error: implicit declaration of function 'ioport_map' [-Werror=implicit-function-declaration]
"

Cc: "John W. Linville" <linville@tuxdriver.com>
Cc: Dan Williams <dcbw@redhat.com>
Cc: linux-wireless@vger.kernel.org
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/Kconfig

@@ -16,7 +16,7 @@ config LIBERTAS_USB
 
 config LIBERTAS_CS
 	tristate "Marvell Libertas 8385 CompactFlash 802.11b/g cards"
-	depends on LIBERTAS && PCMCIA
+	depends on LIBERTAS && PCMCIA && HAS_IOPORT_MAP
 	---help---
 	  A driver for Marvell Libertas 8385 CompactFlash devices.