platform/x86: x86-android-tablets: convert gpio_keys devices to GPIO references

platform/x86: x86-android-tablets: convert gpio_keys devices to GPIO references

Now that gpiolib supports software nodes to describe GPIOs, switch the
driver away from using GPIO lookup tables for gpio_keys devices to using
PROPERTY_ENTRY_GPIO().

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Tested-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Hans de Goede <hansg@kernel.org>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hansg@kernel.org>
Link: https://patch.msgid.link/20250920200713.20193-12-hansg@kernel.org
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>