lib/igt_draw: break if we already wrote every pixel

Due to the nature of accessing a tiled buffer in an untiled way, we
used to loop through the whole buffer all the time. Add a small
mechanism to just break in case we know we already wrote every pixel
we should have written.

On kms_frontbuffer_tracknig/fbc-2p-primscrn-pri-shrfb-draw-pwrite
(with a 3200x1800 primary screen and a 1920x1080 secondary screen), I
could reduce the runtime from ~7.53s to ~6.01s.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

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