soc/intel: Drop romstage_after_car()

Platforms moved to POSTCAR_STAGE so these are no longer used.

Change-Id: I9a7b5a1f29b402d0e996f2c2f8c6db3800cdddf3
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30387
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/include/cpu/intel/romstage.h

@@ -27,8 +27,5 @@ void platform_enter_postcar(void);
 /* romstage_main is called from the cache-as-ram assembly file to prepare
  * CAR stack guards.*/
 asmlinkage void *romstage_main(unsigned long bist);
-/* romstage_after_car() is the C function called after cache-as-ram has
- * been torn down. It is responsible for loading the ramstage. */
-asmlinkage void romstage_after_car(void);
 
 #endif /* _CPU_INTEL_ROMSTAGE_H */