The Wi-Fi module in Apple machines has a "module-instance" device
property that specifies the platform type and is used for firmware
selection. Its value is a string, so add support for string values in
acpi_extract_apple_properties().
Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Aun-Ali Zaidi <admin@kodeit.net>