Replace open coded variant of recently introduced
acpi_get_subsystem_id().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20220928110548.43955-1-andriy.shevchenko@linux.intel.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>