x86: theadorable-x86-dfi-bt700: Add Spansion SPI support and move VIDEO blob

To support the Spansion SPI NOR flashes, this patch enables the support in
defconfig. This increases the U-Boot binary too much so that it does
not fit into its area in the ROM. So also move the VIDEO BIOS blob
a bit to make some space here.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>