MAINTAINERS: update the GPIO git tree entry

My git tree has become the de facto main GPIO tree. Update the
MAINTAINERS file to reflect that.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reported-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Author: brgl

MAINTAINERS

@@ -8385,7 +8385,7 @@ M:	Linus Walleij <linus.walleij@linaro.org>
 M:	Bartosz Golaszewski <brgl@bgdev.pl>
 L:	linux-gpio@vger.kernel.org
 S:	Maintained
-T:	git git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio.git
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
 F:	Documentation/ABI/obsolete/sysfs-gpio
 F:	Documentation/ABI/testing/gpio-cdev
 F:	Documentation/admin-guide/gpio/