MAINTAINERS: Add entry for RDA Micro GPIO driver and binding

Add MAINTAINERS entry for RDA Micro GPIO driver and devicetree binding.
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20191021064413.19840-5-manivannan.sadhasivam@linaro.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -2150,9 +2150,11 @@ L:	linux-unisoc@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
 F:	arch/arm/boot/dts/rda8810pl-*
 F:	drivers/clocksource/timer-rda.c
+F:	drivers/gpio/gpio-rda.c
 F:	drivers/irqchip/irq-rda-intc.c
 F:	drivers/tty/serial/rda-uart.c
 F:	Documentation/devicetree/bindings/arm/rda.yaml
+F:	Documentation/devicetree/bindings/gpio/gpio-rda.yaml
 F:	Documentation/devicetree/bindings/interrupt-controller/rda,8810pl-intc.txt
 F:	Documentation/devicetree/bindings/serial/rda,8810pl-uart.txt
 F:	Documentation/devicetree/bindings/timer/rda,8810pl-timer.txt