spidev: Add Silicon Labs EM3581 device compatible

Add compatible string for Silicon Labs EM3581 device.
Signed-off-by: Vincent Tremblay <vincent@vtremblay.dev>
Link: https://lore.kernel.org/r/20221227023550.569547-2-vincent@vtremblay.devSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spidev.c

@@ -702,6 +702,7 @@ static const struct spi_device_id spidev_spi_ids[] = {
 	{ .name = "m53cpld" },
 	{ .name = "spi-petra" },
 	{ .name = "spi-authenta" },
+	{ .name = "em3581" },
 	{},
 };
 MODULE_DEVICE_TABLE(spi, spidev_spi_ids);
@@ -728,6 +729,7 @@ static const struct of_device_id spidev_dt_ids[] = {
 	{ .compatible = "menlo,m53cpld", .data = &spidev_of_check },
 	{ .compatible = "cisco,spi-petra", .data = &spidev_of_check },
 	{ .compatible = "micron,spi-authenta", .data = &spidev_of_check },
+	{ .compatible = "silabs,em3581", .data = &spidev_of_check },
 	{},
 };
 MODULE_DEVICE_TABLE(of, spidev_dt_ids);