gpio: stm32-gpio: migrate trace to dev and log macro

Change debug to dev_dbg macro and define LOG_CATEGORY.

Remove dev->name as it is already displayed by dev macro.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/gpio/stm32_gpio.c b/drivers/gpio/stm32_gpio.c
index 79d55e8..7184db3 100644
--- a/drivers/gpio/stm32_gpio.c
+++ b/drivers/gpio/stm32_gpio.c
@@ -4,6 +4,8 @@
  * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics.
  */
 
+#define LOG_CATEGORY UCLASS_GPIO
+
 #include <common.h>
 #include <clk.h>
 #include <dm.h>
@@ -331,7 +333,7 @@
 		dev_err(dev, "failed to enable clock\n");
 		return ret;
 	}
-	debug("clock enabled for device %s\n", dev->name);
+	dev_dbg(dev, "clock enabled\n");
 
 	return 0;
 }