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.com


Reviewed-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>