rmodule: add vboot rmodule type

For completeness add a vboot rmodule type since vboot will be
built as an rmodule.

Change-Id: I4b9b1e6f6077f811cafbb81effd4d082c91d4300
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2853
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/include/rmodule.h

@@ -29,6 +29,7 @@ enum {
 	RMODULE_TYPE_SMM,
 	RMODULE_TYPE_SIPI_VECTOR,
 	RMODULE_TYPE_STAGE,
+	RMODULE_TYPE_VBOOT,
 };
 
 struct rmodule;