spi: mt65xx: Switch to device_get_match_data()

Instead of performing yet another match check in the probe function,
simply switch to device_get_match_data().
This is a cleanup and brings no functional change.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220407114428.167091-3-angelogioacchino.delregno@collabora.com


Signed-off-by: Mark Brown <broonie@kernel.org>