dt-bindings: clk: oxnas: remove obsolete bindings

Due to lack of maintenance and stall of development for a few years now,
and since no new features will ever be added upstream, remove the
OX810 and OX820 clock bindings.

Acked-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Daniel Golle <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/20230630-topic-oxnas-upstream-remove-v2-2-fb6ab3dea87c@linaro.org
Signed-off-by: Stephen Boyd <[email protected]>

Author: superna9999