dt-bindings: gpio: Convert TI TPIC2810 GPIO Controller bindings to YAML

Convert gpio-tpic2810 bindings to yaml format and remove outdated
bindings in .txt format.

Signed-off-by: Aparna M <a-m1@ti.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>