of: Add a KUnit test for overlays and test managed APIs

Test the KUnit test managed overlay APIs. Confirm that platform devices
are created and destroyed properly. This provides us confidence that the
test managed APIs work correctly and can be relied upon to provide tests
with fake platform devices and device nodes via overlays compiled into
the kernel image.

Cc: Rob Herring <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Daniel Latypov <[email protected]>
Cc: Brendan Higgins <[email protected]>
Reviewed-by: David Gow <[email protected]>
Cc: Rae Moar <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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