spi: Switch to using is_acpi_device_node() in spi_dev_set_name()

spi: Switch to using is_acpi_device_node() in spi_dev_set_name()

Use is_acpi_device_node() rather than checking ACPI_COMPANION(), such
that when checking for other types of firmware node, the code can
consistently do checks against the fwnode.

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20240416100904.3738093-3-ckeepax@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>