drm: vc4: Use crtc->mode_valid() and encoder->mode_valid() callbacks

Now that we have a callback to check if crtc and encoder supports a
given mode we can use it in vc4 so that we restrict the number of
probed modes to the ones we can actually display.

Also, remove the mode_fixup() calls as these are no longer needed
because mode_valid() will be called before.

Signed-off-by: Jose Abreu <[email protected]>
Cc: Carlos Palminha <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Eric Anholt <[email protected]>
Cc: David Airlie <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]>
Compile-tested and Reviewed-by: Eric Anholt <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/5bea792f91074688c88a2dab8b0a90eec6e98fdf.1495720737.git.joabreu@synopsys.com

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