Add a is_bytcr helper variable to probe().

This is a preparation patch for determining the quirks through querying
the ACPI Device-Specific-Method (DSM) on the codec-device.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20231202123946.54347-4-hdegoede@redhat.comSigned-off-by: Mark Brown <broonie@kernel.org>