soc/intel/broadwell: Fix case of SA_DEV_ROOT

Commit 71756c2 soc/intel: Expand SA_DEV_ROOT for ramstage
removed SA_DEV_ROOT expanding to device pointer. We missed
the case here, use __SIMPLE_DEVICE__ instead for the file.

Change-Id: I4331298837afa3b8c8321da610f99f8f5fa54737
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34546
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/broadwell/memmap.c

@@ -13,6 +13,8 @@
  * GNU General Public License for more details.
  */
 
+#define __SIMPLE_DEVICE__
+
 #include <device/pci_ops.h>
 #include <cbmem.h>
 #include <device/pci.h>