media: v4l: async: Simplify async sub-device fwnode matching

V4L2 async sub-device matching originally used the device nodes only.
Endpoint nodes were taken into use instead as using the device nodes was
problematic for it was in some cases ambiguous which link might have been
in question.

There is however no need to use endpoint nodes on both sides, as the async
sub-device's fwnode can always be trivially obtained using
fwnode_graph_get_remote_endpoint() when needed while what counts is
whether or not the link is between two device nodes, i.e. the device nodes
match.

This will briefly break the adv748x driver but it will be fixed later in
the set, by patch "media: adv748x: Return to endpoint matching".

Signed-off-by: Sakari Ailus <[email protected]>
Tested-by: Philipp Zabel <[email protected]> # imx6qp
Tested-by: Niklas Söderlund <[email protected]> # rcar + adv746x
Tested-by: Aishwarya Kothari <[email protected]> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <[email protected]> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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