Extend the list of maintainers for Samsung pinctrl driver with Sylwester
and Krzysztof.

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: NTomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>