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/cmd/Kconfig b/cmd/Kconfig
index 2caa4af..a351283 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2226,6 +2226,14 @@
 	  The name 'lcdputs' is a bit of a misnomer, but so named because the
 	  video device is often an LCD.
 
+config CMD_SELECT_FONT
+	bool "select font size"
+	depends on VIDEO
+	default n
+	help
+	  Enabling this will provide 'font' command.
+	  Allows font selection at runtime.
+
 endmenu
 
 source "cmd/ti/Kconfig"