power: regulator: 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>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/drivers/power/regulator/scmi_regulator.c b/drivers/power/regulator/scmi_regulator.c
index b3142bf..3ddeaf4 100644
--- a/drivers/power/regulator/scmi_regulator.c
+++ b/drivers/power/regulator/scmi_regulator.c
@@ -2,6 +2,9 @@
 /*
  * Copyright (C) 2020-2021 Linaro Limited
  */
+
+#define LOG_CATEGORY UCLASS_REGULATOR
+
 #include <common.h>
 #include <dm.h>
 #include <errno.h>