UPSTREAM: nb/amdk8: Link coherent_ht.c

BUG=none
BRANCH=none
TEST=none

Change-Id: I1613846dfff5e2a099c00a79dfabaee12705e398
Signed-off-by: Furquan Shaikh <furquan@chromium.org>
Original-Commit-Id: f9f91a70b9
Original-Change-Id: I1ef1323dc1f3005ed194ad82b75c87ef41864217
Original-Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Original-Reviewed-on: https://review.coreboot.org/19367
Original-Tested-by: build bot (Jenkins)
Original-Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://chromium-review.googlesource.com/490683

src/include/cpu/amd/model_fxx_rev.h

@@ -1,4 +1,5 @@
 #include <arch/cpu.h>
+#include <arch/io.h>
 
 int init_processor_name(void);