firmware: scmi: Include device_compat.h

This header is necessary for the dev_xxx macros.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/firmware/scmi/smt.c b/drivers/firmware/scmi/smt.c
index ce8fe49..d254787 100644
--- a/drivers/firmware/scmi/smt.c
+++ b/drivers/firmware/scmi/smt.c
@@ -7,6 +7,7 @@
 #include <common.h>
 #include <cpu_func.h>
 #include <dm.h>
+#include <dm/device_compat.h>
 #include <errno.h>
 #include <scmi_agent.h>
 #include <asm/cache.h>