video console: move vidconsole_get_font_size() logic to driver ops

Since multiple vidconsole drivers exists, vidconsole_get_font_size()
implementation cannot longer live in vidconsole_uclass.c file.

Move current vidconsole_get_font_size logic to truetype driver ops.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/video_console.h b/include/video_console.h
index 3e1e00c..7701032 100644
--- a/include/video_console.h
+++ b/include/video_console.h
@@ -161,6 +161,15 @@
 			struct vidfont_info *info);
 
 	/**
+	 * get_font_size() - get the current font name and size
+	 *
+	 * @dev: vidconsole device
+	 * @sizep: Place to put the font size (nominal height in pixels)
+	 * Returns: Current font name
+	 */
+	const char *(*get_font_size)(struct udevice *dev, uint *sizep);
+
+	/**
 	 * select_font() - Select a particular font by name / size
 	 *
 	 * @dev:	Device to adjust
@@ -303,9 +312,10 @@
  *
  * @dev: vidconsole device
  * @sizep: Place to put the font size (nominal height in pixels)
- * Returns: Current font name
+ * @name: pointer to font name, a placeholder for result
+ * Return: 0 if OK, -ENOSYS if not implemented in driver
  */
-const char *vidconsole_get_font_size(struct udevice *dev, uint *sizep);
+int vidconsole_get_font_size(struct udevice *dev, const char **name, uint *sizep);
 
 #ifdef CONFIG_VIDEO_COPY
 /**