spi: spi-at91-usart: Remove unused OF table 'struct of_device_id'

The only way this driver can be probed by MFD via its parent device.

No other reference to 'microchip,at91sam9g45-usart-spi' exists in the kernel.

Fixes the following W=1 kernel build warning(s):

 drivers/spi/spi-at91-usart.c:684:34: warning: ‘at91_usart_spi_dt_ids’ defined but not used [-Wunused-const-variable=]
 684 | static const struct of_device_id at91_usart_spi_dt_ids[] = {
 | ^~~~~~~~~~~~~~~~~~~~~

Suggested-by: Alexandre Belloni <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
Acked-by: Alexandre Belloni <[email protected]>
Cc: Radu Pirea <[email protected]>
Cc: Nicolas Ferre <[email protected]>
Cc: Ludovic Desroches <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Lee Jones

drivers/spi/spi-at91-usart.c

@@ -681,13 +681,6 @@ static const struct dev_pm_ops at91_usart_spi_pm_ops = {
 			   at91_usart_spi_runtime_resume, NULL)
 };
 
-static const struct of_device_id at91_usart_spi_dt_ids[] = {
-	{ .compatible = "microchip,at91sam9g45-usart-spi"},
-	{ /* sentinel */}
-};
-
-MODULE_DEVICE_TABLE(of, at91_usart_spi_dt_ids);
-
 static struct platform_driver at91_usart_spi_driver = {
 	.driver = {
 		.name = "at91_usart_spi",