libpayload: video: Add support for font scaling with a factor

This introduces support for font scaling with a factor provided via
Kconfig. In practice, the font itself is not scaled at any point in
memory and only the logic to determine whether a pixel should be filled
or not is changed.

Thus, it should not significantly impact either the access time or
memory use.

Change-Id: Idff210617c9ec08c6034aef107cfdb34c7cdf029
Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-on: https://review.coreboot.org/20709
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

payloads/libpayload/drivers/video/geodelx.c

@@ -268,7 +268,7 @@ static int geodelx_init(void)
 	dcaddr = pci_read_resource(dev, 2);
 	vgaddr = pci_read_resource(dev, 3);
 
-	font_init();
+	font_init(vga_mode.hactive);
 
 	init_video_mode();