soc/amd/stoneyridge: Fix building with USBDEBUG

Change-Id: I425583377cba8d57acabfd59922f421d1fb5891f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36883
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/soc/amd/stoneyridge/enable_usbdebug.c

@@ -22,6 +22,7 @@
 #include <device/pci_def.h>
 #include <soc/pci_devs.h>
 #include <soc/southbridge.h>
+#include <amdblocks/acpimmio.h>
 
 pci_devfn_t pci_ehci_dbg_dev(unsigned int hcd_idx)
 {