arm: socfpga: dts: Add spi0 alias for Cadence QSPI driver

Without this alias, DM based probing does not work. So lets add this
alias to get the bus numbering correct.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Chin Liang See <clsee@altera.com>
Cc: Dinh Nguyen <dinguyen@altera.com>
Cc: Vince Bridgers <vbridger@altera.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Pavel Machek <pavel@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>

arch/arm/dts/socfpga_cyclone5_socrates.dts

@@ -14,6 +14,10 @@
 		bootargs = "console=ttyS0,115200";
 	};
 
+ 	aliases {
+		spi0 = "/spi@ff705000";		/* QSPI */
+ 	};
+
 	memory {
 		name = "memory";
 		device_type = "memory";