net: Remove CONFIG_KMOD from net/ (towards removing CONFIG_KMOD entirely)

Some code here depends on CONFIG_KMOD to not try to load
protocol modules or similar, replace by CONFIG_MODULES
where more than just request_module depends on CONFIG_KMOD
and and also use try_then_request_module in ebtables.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/ematch.c b/net/sched/ematch.c
index 5e6f82e..e82519e 100644
--- a/net/sched/ematch.c
+++ b/net/sched/ematch.c
@@ -224,7 +224,7 @@
 
 		if (em->ops == NULL) {
 			err = -ENOENT;
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
 			__rtnl_unlock();
 			request_module("ematch-kind-%u", em_hdr->kind);
 			rtnl_lock();