drm/i915/fbdev: Stop repeating tile configuration on stagnation

If we cease making progress in finding matching outputs for a tiled
configuration, stop looping over the remaining unconfigured outputs.

v2: Use conn_seq (instead of pass) to only apply tile configuration on
first pass.

Fixes: b0ee9e7fa5b4 ("drm/fb: add support for tiled monitor configurations. (v2)")
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tomasz Lis <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: <[email protected]> # v3.19+
Reviewed-by: Tomasz Lis <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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