dm: define LOG_CATEGORY for all uclass

Define LOG_CATEGORY for all uclass to allow filtering with
log command.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/block/ide.c b/drivers/block/ide.c
index 862a85b..c99076c 100644
--- a/drivers/block/ide.c
+++ b/drivers/block/ide.c
@@ -4,6 +4,8 @@
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  */
 
+#define LOG_CATEGORY UCLASS_IDE
+
 #include <common.h>
 #include <ata.h>
 #include <blk.h>