northbridge/intel/i440bx: Unify UDELAY selection

Instead of manually including udelay_io.c in each romstage,
select UDELAY_IO for all i440BX boards in the chipset.

Change-Id: I411191927f3fba1d0749edcf79378e8013fb195a
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/13781
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/northbridge/intel/i440bx/Kconfig b/src/northbridge/intel/i440bx/Kconfig
index 828c693..3f574a4 100644
--- a/src/northbridge/intel/i440bx/Kconfig
+++ b/src/northbridge/intel/i440bx/Kconfig
@@ -17,6 +17,7 @@
 	bool
 	select HAVE_DEBUG_RAM_SETUP
 	select LATE_CBMEM_INIT
+	select UDELAY_IO
 
 config SDRAMPWR_4DIMM
 	bool