drm/atomic-helper: Refactor crtc & encoder-bridge op loops into separate functions

The way any singular display pipeline, in need of a modeset, gets
enabled is as follows -

	crtc enable
	(all) bridge pre-enable
	encoder enable
	(all) bridge enable

- and the disable sequence is exactly the reverse of this.

The crtc operations occur by looping over the old and new crtc states,
while the encoder and bridge operations occur together, by looping over
the connector states of the display pipelines.

Refactor these operations - crtc enable/disable, and encoder & bridge
(pre/post) enable/disable - into separate functions each, to make way
for the re-ordering of the enable/disable sequences.

This patch doesn't alter the sequence of crtc/encoder/bridge operations
in any way, but helps to cleanly pave the way for the next two patches,
by maintaining logical bisectability.

Reviewed-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Tested-by: Tomi Valkeinen <[email protected]>
Tested-by: Alexander Sverdlin <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Signed-off-by: Aradhya Bhatia <[email protected]>
Tested-by: Devarsh Thakkar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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