device/dram/spd: Add missing <smbios.h>

Use of smbios_memory_type needs <smbios.h>.

Change-Id: Iacab6171c61abd047c09ff7e20313a455bd8414f
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82245
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

src/device/dram/spd.c

@@ -5,6 +5,7 @@
 #include <device/dram/ddr4.h>
 #include <device/dram/ddr5.h>
 #include <device/dram/spd.h>
+#include <smbios.h>
 #include <spd.h>
 #include <stddef.h>