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>
ARM: rpi_b: attempt to turn on power to SD controller

This can't be done yet: The firmware gives an error reponse to
set_power_state. See:
https://github.com/raspberrypi/firmware/issues/106

However, this isn't needed in practice, since the boot firmware must
have turned on the power itself, since it loaded U-Boot from the SD
card.

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