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/include/log.h b/include/log.h
index fc0d598..2b86c7d 100644
--- a/include/log.h
+++ b/include/log.h
@@ -104,6 +104,8 @@
 	LOGC_FS,
 	/** @LOGC_EXPO: Related to expo handling */
 	LOGC_EXPO,
+	/** @LOGC_CONSOLE: Related to the console and stdio */
+	LOGC_CONSOLE,
 	/** @LOGC_COUNT: Number of log categories */
 	LOGC_COUNT,
 	/** @LOGC_END: Sentinel value for lists of log categories */