drm/i915: Do plane/etc. updates more atomically across pipes

Perform all the intel_pre_update_crtc() stuff for all pipes first,
and only then do the intel_update_crtc() vblank evasion stuff for
every pipe back to back. This should make it more likely that
the plane updates from multiple pipes happen on the same frame
(assuming the pipes are running in sync, eg. due to bigjoiner
or port sync).

Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Stanislav Lisovskiy <[email protected]>

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