[LIB]: Make TEXTSEARCH_BM plain tristate like the others

And select it when the relevant modules are enabled.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index 59d3e71..45d3bc0 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -491,6 +491,7 @@
 	depends on NET_EMATCH
 	select TEXTSEARCH
 	select TEXTSEARCH_KMP
+	select TEXTSEARCH_BM
 	select TEXTSEARCH_FSM
 	---help---
 	  Say Y here if you want to be ablt to classify packets based on