of: property: Add fw_devlink support for "gpio" and "gpios" binding

of: property: Add fw_devlink support for "gpio" and "gpios" binding

To provide backward compatibility for boards that use deprecated DT
bindings, we need to add fw_devlink support for "gpio" and "gpios".

We also need to ignore these properties on nodes with "gpio-hog"
property because their gpio[s] are all supplied by the parent node.

Fixes: e590474768f1 ("driver core: Set fw_devlink=on by default")
Cc: linux-tegra <linux-tegra@vger.kernel.org>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20210121225712.1118239-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>