MAINTAINERS: pinctrl: Add git tree to Samsung pinctrl entry

Add a Git tree on @kernel.org for maintaining the Samsung pinctrl
drivers.  The tree will be maintained in a shared model between current
Samsung pinctrl maintainers.  Pull requests will be going to Linus
Walleij.

Also add the patchwork for linux-samsung-soc mailing list which will be
used for handling the patches.
Signed-off-by: NKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: NTomasz Figa <tomasz.figa@gmail.com>
Acked-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -9909,6 +9909,8 @@ M:	Krzysztof Kozlowski <krzk@kernel.org>
 M:	Sylwester Nawrocki <s.nawrocki@samsung.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-samsung-soc@vger.kernel.org (moderated for non-subscribers)
+Q:	https://patchwork.kernel.org/project/linux-samsung-soc/list/
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/samsung.git
 S:	Maintained
 F:	drivers/pinctrl/samsung/
 F:	include/dt-bindings/pinctrl/samsung.h