log: Add a new log category for the console

Add a new category which covers the console, including the stdio
drivers.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/console.c b/common/console.c
index 85f6272..09d4b51 100644
--- a/common/console.c
+++ b/common/console.c
@@ -4,6 +4,8 @@
  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
  */
 
+#define LOG_CATEGORY	LOGC_CONSOLE
+
 #include <console.h>
 #include <debug_uart.h>
 #include <display_options.h>