ALSA: hda: cs35l41: Utilize acpi_get_subsystem_id()

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/20220905165826.35979-2-andriy.shevchenko@linux.intel.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>