AMD MTRR: Add common add_uma_resource_below_tolm()

Change-Id: I9eee88dc619ac5d9c77153db522a6ead65f6c9b1
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/19376
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/include/cpu/amd/mtrr.h b/src/include/cpu/amd/mtrr.h
index b65c23b..b31648d 100644
--- a/src/include/cpu/amd/mtrr.h
+++ b/src/include/cpu/amd/mtrr.h
@@ -41,6 +41,8 @@
 #include <cpu/x86/msr.h>
 
 void amd_setup_mtrrs(void);
+struct device;
+void add_uma_resource_below_tolm(struct device *nb, int idx);
 
 static inline __attribute__((always_inline)) msr_t rdmsr_amd(unsigned int index)
 {