src: remove force-included header rules.h from individual files

The header file `rules.h` is automatically included in the build by the
top level makefile using the command:
`-include src/soc/intel/common/block/scs/early_mmc.c`.

Similar to `config.h` and 'kconfig.h`, this file does not need to be
included manually, so remove it.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I23a1876b4b671d8565cf9b391d3babf800c074db
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67348
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/common/block/cpu/car/cache_as_ram.S

@@ -7,7 +7,6 @@
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/x86/post_code.h>
-#include <rules.h>
 #include <intelblocks/msr.h>
 
 .section .init, "ax", @progbits