dt-bindings: gpio: davinci: Add new compatible for J721E SoCs

J721e SoCs have same gpio IP as K2G davinci gpio. Add a new compatible to
handle J721E SoCs.
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20190809082947.30590-2-lokeshvutla@ti.comReviewed-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-davinci.txt

@@ -6,6 +6,7 @@ Required Properties:
 						66AK2E SoCs
 			"ti,k2g-gpio", "ti,keystone-gpio": for 66AK2G
 			"ti,am654-gpio", "ti,keystone-gpio": for TI K3 AM654
+			"ti,j721e-gpio", "ti,keystone-gpio": for J721E SoCs
 
 - reg: Physical base address of the controller and the size of memory mapped
        registers.