dt: socfpga: Rename snps, dw-spi-mmio to snps, dw-apb-ssi

Linux now also contains SPI driver, yet the name is 'snps,dw-apb-ssi'.
Fix the naming before we have to support both names.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <clsee@opensource.altera.com>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Pavel Machek <pavel@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Vince Bridgers <vbridger@opensource.altera.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Pavel Machek <pavel@denx.de>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
diff --git a/drivers/spi/designware_spi.c b/drivers/spi/designware_spi.c
index 0210667..700f616 100644
--- a/drivers/spi/designware_spi.c
+++ b/drivers/spi/designware_spi.c
@@ -409,7 +409,7 @@
 };
 
 static const struct udevice_id dw_spi_ids[] = {
-	{ .compatible = "snps,dw-spi-mmio" },
+	{ .compatible = "snps,dw-apb-ssi" },
 	{ }
 };