console: Provide a documentation for console_search_dev()

Provide a documentation for console_search_dev().
Suggested-by: NSimon Glass <sjg@chromium.org>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>

include/console.h

@@ -25,6 +25,16 @@ void clear_ctrlc(void);	/* clear the Control-C condition */
 int disable_ctrlc(int);	/* 1 to disable, 0 to enable Control-C detect */
 int confirm_yesno(void);        /*  1 if input is "y", "Y", "yes" or "YES" */
 
+/**
+ * console_search_dev() - search for stdio device with given flags and name
+ * @flags: device flags as per input/output/system
+ * @name: device name
+ *
+ * Iterates over registered STDIO devices and match them with given @flags
+ * and @name.
+ *
+ * @return pointer to the &struct stdio_dev if found, or NULL otherwise
+ */
 struct stdio_dev *console_search_dev(int flags, const char *name);
 
 #ifdef CONFIG_CONSOLE_RECORD