of: property: Simplify of_link_to_phandle()

The driver core now:
- Has the parent device of a supplier pick up the consumers if the
  supplier never has a device created for it.
- Ignores a supplier if the supplier has no parent device and will never
  be probed by a driver

And already prevents creating a device link with the consumer as a
supplier of a parent.

So, we no longer need to find the "compatible" node of the supplier or
do any other checks in of_link_to_phandle(). We simply need to make sure
that the supplier is available in DT.

Signed-off-by: Saravana Kannan <[email protected]>
Tested-by: Colin Foster <[email protected]>
Tested-by: Sudeep Holla <[email protected]>
Tested-by: Douglas Anderson <[email protected]>
Tested-by: Geert Uytterhoeven <[email protected]>
Tested-by: Luca Weiss <[email protected]> # qcom/sm7225-fairphone-fp4
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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