dt-bindings: adc-joystick: add poll-interval

Add poll-interval support for the adc-joystick documentation. This is
an optional value and if not provided the adc-joystick works as it
does today (with buffers). If this value is provided, the adc-joystick
driver is polled at the specified interval. The existing attribute of
"poll-interval" was used instead of complying with property-units.yaml
after discussion of the issue on the mailing list.

Signed-off-by: Maya Matuszczyk <[email protected]>
Signed-off-by: Chris Morgan <[email protected]>
Reviewed-by: Rob Herring <[email protected]>
Acked-by: Artur Rojek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

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