x86: Correct spi node alias

With recent changes spi node was moved to a place as a subnode under
pch, so update the alias to refer to its correct place as well.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/dts/galileo.dts b/arch/x86/dts/galileo.dts
index a2f5a1f..dd75fc4 100644
--- a/arch/x86/dts/galileo.dts
+++ b/arch/x86/dts/galileo.dts
@@ -18,7 +18,7 @@
 	compatible = "intel,galileo", "intel,quark";
 
 	aliases {
-		spi0 = "/spi";
+		spi0 = &spi;
 	};
 
 	config {
@@ -115,7 +115,7 @@
 				>;
 			};
 
-			spi {
+			spi: spi {
 				#address-cells = <1>;
 				#size-cells = <0>;
 				compatible = "intel,ich-spi";