net: dwc_eth_qos: define LOG_CATEGORY

Define LOG_CATEGORY to allow filtering with log command.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
diff --git a/drivers/net/dwc_eth_qos.c b/drivers/net/dwc_eth_qos.c
index 79eb6cc..5851018 100644
--- a/drivers/net/dwc_eth_qos.c
+++ b/drivers/net/dwc_eth_qos.c
@@ -27,6 +27,8 @@
  *    all clock and reset signals to the HW block.
  */
 
+#define LOG_CATEGORY UCLASS_ETH
+
 #include <common.h>
 #include <clk.h>
 #include <cpu_func.h>