AMD geode: Avoid conflicting main() declaration

Declaration of main in cpu/amd/car.h conflicts with the
definition of main required for x86/postcar.c in main_decl.h.

Change-Id: I19507b89a1e2ecf88ca574c560d4a9e9a3756f37
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/18615
Tested-by: build bot (Jenkins)
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/lippert/roadrunner-lx/romstage.c b/src/mainboard/lippert/roadrunner-lx/romstage.c
index 7e0e2a5..3ad8944 100644
--- a/src/mainboard/lippert/roadrunner-lx/romstage.c
+++ b/src/mainboard/lippert/roadrunner-lx/romstage.c
@@ -81,7 +81,7 @@
 	}
 }
 
-void main(unsigned long bist)
+void asmlinkage mainboard_romstage_entry(unsigned long bist)
 {
 
 	static const struct mem_controller memctrl[] = {