spi: davinci: Use device_get_match_data() helper

Use the device_get_match_data() helper instead of open coding.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Suggested-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/1617152319-17701-1-git-send-email-tiantao6@hisilicon.com


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