configs: sandbox64: Enable video 12x22 font support

Align the sandbox64 defconfig with sandbox defconfig. Enable missing
12x22 font support. This fixes ut_dm_dm_test_video_text_12x22 test .

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Simon Glass <sjg@chromium.org>