boot: fdt_simplefb: Enumerate framebuffer info from video handoff

Enable and update simple-framebuffer node using the video handoff
bloblist if video was enabled at SPL stage and corresponding video
bloblist was received at u-boot proper with necessary parameters.

Signed-off-by: Devarsh Thakkar <devarsht@ti.com>
Reviewed-by: Nikhil M Jain <n-jain1@ti.com>