arm: stm32mp: migrate trace to log macro

Change debug and pr_ macro to log macro and define LOG_CATEGORY.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/mach-stm32mp/cmd_stm32key.c b/arch/arm/mach-stm32mp/cmd_stm32key.c
index 544bab3..42fdc11 100644
--- a/arch/arm/mach-stm32mp/cmd_stm32key.c
+++ b/arch/arm/mach-stm32mp/cmd_stm32key.c
@@ -6,6 +6,7 @@
 #include <common.h>
 #include <command.h>
 #include <console.h>
+#include <log.h>
 #include <misc.h>
 #include <dm/device.h>
 #include <dm/uclass.h>
@@ -34,7 +35,7 @@
 					  DM_DRIVER_GET(stm32mp_bsec),
 					  &dev);
 	if (ret) {
-		pr_err("Can't find stm32mp_bsec driver\n");
+		log_err("Can't find stm32mp_bsec driver\n");
 		return;
 	}