x86emu: Move realmode handler into own directory

It's really a feature in parallel to YABEL/x86emu. Reflect this in
the directory structure.

Change-Id: Ie88e4fa6bfef13d23c55b2db3faacbd90f8cc30b
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/1889
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/devices/oprom/Makefile.inc b/src/devices/oprom/Makefile.inc
index 62fdc31..aa4a74d 100644
--- a/src/devices/oprom/Makefile.inc
+++ b/src/devices/oprom/Makefile.inc
@@ -17,9 +17,7 @@
 ## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 ##
 
-ramstage-$(CONFIG_PCI_OPTION_ROM_RUN_REALMODE) += x86.c
-ramstage-$(CONFIG_PCI_OPTION_ROM_RUN_REALMODE) += x86_asm.S
-ramstage-$(CONFIG_PCI_OPTION_ROM_RUN_REALMODE) += x86_interrupts.c
-
 subdirs-$(CONFIG_PCI_OPTION_ROM_RUN_YABEL) += x86emu
 subdirs-$(CONFIG_PCI_OPTION_ROM_RUN_YABEL) += yabel
+subdirs-$(CONFIG_PCI_OPTION_ROM_RUN_REALMODE) += realmode
+