pinctrl: dt-bindings: samsung: Update documentation with new macros

Update examples in Samsung pinctrl dt-bindings with new macros coming
from header file.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>