intel/cpu: rename car.h to romstage.h

This header has nothing to do with cache-as-ram. Therefore, 'car'
is the wrong term to use. It is about providing a prototype for
*romstage*.

Change-Id: Ibc5bc6f3c38e74d6337c12f246846853ceae4743
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/6661
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/include/cpu/intel/romstage.h b/src/include/cpu/intel/romstage.h
new file mode 100644
index 0000000..0ebb912
--- /dev/null
+++ b/src/include/cpu/intel/romstage.h
@@ -0,0 +1,7 @@
+#ifndef _CPU_INTEL_ROMSTAGE_H
+#define _CPU_INTEL_ROMSTAGE_H
+
+/* std signature of entry-point to romstage.c */
+void main(unsigned long bist);
+
+#endif /* _CPU_INTEL_ROMSTAGE_H */