nb/amd/amdk8: Link reset_test.c

This needs some extra headers in amdk8/raminit.c that were otherwise
provided by that file.

Change-Id: I80450e5eb32eb502b3d777c56790db90491fc995
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/19360
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/cpu/amd/model_fxx/init_cpus.c

@@ -11,6 +11,8 @@
  * GNU General Public License for more details.
  */
 
+#include <cpu/x86/lapic.h>
+#include <northbridge/amd/amdk8/amdk8.h>
 #include "cpu/amd/car/post_cache_as_ram.c"
 
 #if CONFIG_HAVE_OPTION_TABLE