dt-bindings: clock: milbeaut: Drop providers and consumers from example

Convention for examples is to only show what's covered by the binding,
so drop the consumer "socionext,milbeaut-usio-uart" and input clock
provider "fixed-clock" from the example. "socionext,milbeaut-usio-uart"
is also not documented by a schema which caused a warning.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240520222646.1741958-1-robh@kernel.org


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>