MAINTAINERS: Take maintainership for GPIO ACPI support

We will help Linus to maintain GPIO ACPI support.

Append a dedicated record to the MAINTAINERS data base.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -5682,6 +5682,15 @@ F:	include/asm-generic/gpio.h
 F:	include/uapi/linux/gpio.h
 F:	tools/gpio/
 
+GPIO ACPI SUPPORT
+M:	Mika Westerberg <mika.westerberg@linux.intel.com>
+M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+L:	linux-gpio@vger.kernel.org
+L:	linux-acpi@vger.kernel.org
+S:	Maintained
+F:	Documentation/acpi/gpio-properties.txt
+F:	drivers/gpio/gpiolib-acpi.c
+
 GRE DEMULTIPLEXER DRIVER
 M:	Dmitry Kozlov <xeb@mail.ru>
 L:	netdev@vger.kernel.org