src: Remove redundant include <rules.h>

Change-Id: Ie4692246d059734bb5bad6c64042b64068636ab6
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50300
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/arch/riscv/romstage.c

@@ -9,7 +9,6 @@
 
 #include <arch/stages.h>
 #include <arch/smp/smp.h>
-#include <rules.h>
 #include <mcall.h>
 
 void stage_entry(int hart_id, void *fdt)