amd/gardenia: Fix includes after platform change to soc/

Change-Id: I63c6febf8ba953a642fd7b04a555a4c6704abc79
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/20496
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/amd/gardenia/romstage.c

@@ -21,8 +21,8 @@
 #include <cpu/x86/lapic.h>
 #include <cpu/x86/bist.h>
 #include <cpu/amd/car.h>
-#include <northbridge/amd/pi/agesawrapper.h>
-#include <northbridge/amd/pi/agesawrapper_call.h>
+#include <agesawrapper.h>
+#include <agesawrapper_call.h>
 #include <soc/hudson.h>
 #include <amdblocks/psp.h>