drivers/generic/gpio_keys: Write device ACPI status

Allows device to be hidden from OS (Windows) via devicetree 'hidden'
keyword.

TEST=tested with rest of patch train

Change-Id: I81482bd19e24627cab80deed2b9057f45b6ac0a0
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78037
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/generic/gpio_keys/gpio_keys.c

@@ -87,6 +87,8 @@ static void gpio_keys_fill_ssdt_generator(const struct device *dev)
 		acpi_dp_add_child(dsd, "button-0", child);
 	acpi_dp_write(dsd);
 
+	acpigen_write_STA(acpi_device_status(dev));
+
 	acpigen_pop_len(); /* Device */
 	acpigen_pop_len(); /* Scope */
 }