MAINTAINERS: Add entry for Synopsys DesignWare APB GPIO driver

This patch adds maintainer for Synopsys DesignWare APB GPIO driver.
Signed-off-by: Hoan Tran <hotran@apm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -12883,6 +12883,13 @@ F:	arch/arc/plat-axs10x
 F:	arch/arc/boot/dts/ax*
 F:	Documentation/devicetree/bindings/arc/axs10*
 
+SYNOPSYS DESIGNWARE APB GPIO DRIVER
+M:	Hoan Tran <hotran@apm.com>
+L:	linux-gpio@vger.kernel.org
+S:	Maintained
+F:	drivers/gpio/gpio-dwapb.c
+F:	Documentation/devicetree/bindings/gpio/snps-dwapb-gpio.txt
+
 SYNOPSYS DESIGNWARE DMAC DRIVER
 M:	Viresh Kumar <vireshk@kernel.org>
 M:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>