spi: imx: Remove unused .id_table support

Since 5.10-rc1 i.MX is a devicetree-only platform and the existing
.id_table support in this driver was only useful for old non-devicetree
platforms.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Link: https://lore.kernel.org/r/20201116202606.29888-1-festevam@gmail.com


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