dt-bindings: pinctrl: samsung: stop using bindings header with constants

The bindings header with pin controller register values is being
deprecated and DTS already switched to a DTS-local header.

Do not reference the bindings header in schema and replace the defines
with raw values.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220816133016.77553-2-krzysztof.kozlowski@linaro.org