lib: compile mdelay for romstage

Mimicking change I7037308d2, always compile mdelay for romstage.
The boards that #included delay.c in the romstage now rely on the linker
instead, which is a desirable cleanup.

Change-Id: I7e5169ec94e5417536e967194e8eab67381e7c98
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/13115
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/msi/ms7260/romstage.c

@@ -28,7 +28,7 @@
 #include <cpu/amd/model_fxx_rev.h>
 #include "southbridge/nvidia/mcp55/early_smbus.c"
 #include <northbridge/amd/amdk8/raminit.h>
-#include "lib/delay.c"
+#include <delay.h>
 #include <lib.h>
 #include <spd.h>
 #include <cpu/x86/lapic.h>

src/mainboard/msi/ms9282/romstage.c

@@ -29,7 +29,7 @@
 #include <cpu/amd/model_fxx_rev.h>
 #include "southbridge/nvidia/mcp55/early_smbus.c"
 #include <northbridge/amd/amdk8/raminit.h>
-#include "lib/delay.c"
+#include <delay.h>
 #include <cpu/x86/lapic.h>
 #include "northbridge/amd/amdk8/reset_test.c"
 #include "northbridge/amd/amdk8/debug.c"

src/mainboard/msi/ms9652_fam10/romstage.c

@@ -33,7 +33,7 @@
 #include "southbridge/nvidia/mcp55/early_smbus.c"
 #include <northbridge/amd/amdfam10/raminit.h>
 #include <northbridge/amd/amdfam10/amdfam10.h>
-#include "lib/delay.c"
+#include <delay.h>
 #include <cpu/x86/lapic.h>
 #include "northbridge/amd/amdfam10/reset_test.c"
 #include <superio/winbond/common/winbond.h>