fb: Use an igt_fb for the cairo shadow buffer

In the case where an igt_fb user wants to get a cairo surface out of that
framebuffer, if the format of that framebuffer cannot be imported as-is in
Cairo, the current code will do an anonymous mapping to create a shadow
buffer where an RGB24 copy of that buffer will be created.

However, making that shadow buffer into an igt_fb itself will help us do
further improvements on the conversion code.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

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