clk: scmi: define LOG_CATEGORY

Define LOG_CATEGORY to allow filtering with log command.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
diff --git a/drivers/clk/clk_scmi.c b/drivers/clk/clk_scmi.c
index 93a4819..9a0a6f6 100644
--- a/drivers/clk/clk_scmi.c
+++ b/drivers/clk/clk_scmi.c
@@ -2,6 +2,9 @@
 /*
  * Copyright (C) 2019-2020 Linaro Limited
  */
+
+#define LOG_CATEGORY UCLASS_CLK
+
 #include <common.h>
 #include <clk-uclass.h>
 #include <dm.h>