ARM: bcm2835: fill in simple-framebuffer props during bootz/m

If the device tree contains a node with compatible = "simple-framebuffer",
fill in all the properties needed to represent the display configuration
that U-Boot set up, and delete any status property, so that the kernel
will activate the frame-buffer.

Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>