video console: allow font size configuration at runtime

Allow font size configuration at runtime for console_simple.c
driver. This needed for unit testing different fonts.

Configuring is done by `font` command, also used for font
selection in true type console.

Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index ce97eb4..e1bcc89 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -165,6 +165,7 @@
 
 config CONSOLE_TRUETYPE
 	bool "Support a console that uses TrueType fonts"
+	select CMD_SELECT_FONT
 	help
 	  TrueTrype fonts can provide outline-drawing capability rather than
 	  needing to provide a bitmap for each font and size that is needed.