revert "s390/net: lcs: use IS_ENABLED() for kconfig detection"

The referenced patch is causing build errors when ETHERNET=y and
FDDI=m. While we work out the preferred patch(es), revert this patch
to make the pain go away.

Fixes: 12827233 ("s390/net: lcs: use IS_ENABLED() for kconfig detection")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Link: lore.kernel.org/r/202306202129.pl0AqK8G-lkp@intel.com
Cc: Alexandra Winter <wintera@linux.ibm.com>
Cc: Wenjia Zhang <wenjia@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230622155409.27311-1-rdunlap@infradead.orgSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/s390/net/lcs.c

@@ -36,7 +36,7 @@
 #include "lcs.h"
 
 
-#if !IS_ENABLED(CONFIG_ETHERNET) && !IS_ENABLED(CONFIG_FDDI)
+#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
 #error Cannot compile lcs.c without some net devices switched on.
 #endif
 
@@ -1601,14 +1601,14 @@ lcs_startlan_auto(struct lcs_card *card)
 	int rc;
 
 	LCS_DBF_TEXT(2, trace, "strtauto");
-#if IS_ENABLED(CONFIG_ETHERNET)
+#ifdef CONFIG_ETHERNET
 	card->lan_type = LCS_FRAME_TYPE_ENET;
 	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
 	if (rc == 0)
 		return 0;
 
 #endif
-#if IS_ENABLED(CONFIG_FDDI)
+#ifdef CONFIG_FDDI
 	card->lan_type = LCS_FRAME_TYPE_FDDI;
 	rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
 	if (rc == 0)
@@ -2140,13 +2140,13 @@ lcs_new_device(struct ccwgroup_device *ccwgdev)
 		goto netdev_out;
 	}
 	switch (card->lan_type) {
-#if IS_ENABLED(CONFIG_ETHERNET)
+#ifdef CONFIG_ETHERNET
 	case LCS_FRAME_TYPE_ENET:
 		card->lan_type_trans = eth_type_trans;
 		dev = alloc_etherdev(0);
 		break;
 #endif
-#if IS_ENABLED(CONFIG_FDDI)
+#ifdef CONFIG_FDDI
 	case LCS_FRAME_TYPE_FDDI:
 		card->lan_type_trans = fddi_type_trans;
 		dev = alloc_fddidev(0);