mb/emulation/qemu-riscv/cbmem.c: Fix device_tree.h include

Change-Id: I0b49ff8b6275fdde326c79ec21c34faa03094f9e
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83160
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

src/mainboard/emulation/qemu-riscv/cbmem.c

@@ -3,7 +3,7 @@
 #include <cbmem.h>
 #include <symbols.h>
 #include <ramdetect.h>
-#include <device_tree.h>
+#include <commonlib/device_tree.h>
 #include <mcall.h>
 
 uintptr_t cbmem_top_chipset(void)