efi_loader: Let networking support depend on NETDEVICES

CONFIG_NET does not imply that there are actually network devices
available, only CONFIG_NETDEVICES does. Changing to this dependency
obsoletes the check in Kconfig because NETDEVICES means DM_ETH.

Fixes: 0efe1bcf5c2c ("efi_loader: Add network access support")
Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index a340bc3..e40f64f 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -331,7 +331,7 @@
 		if (ret != EFI_SUCCESS)
 			goto out;
 	}
-#ifdef CONFIG_NET
+#ifdef CONFIG_NETDEVICES
 	ret = efi_net_register();
 	if (ret != EFI_SUCCESS)
 		goto out;