ARM: dts: aspeed-g4: Add all flash chips

The FMC supports five chip selects, so describe the five possible flash
chips.
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Signed-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-g4.dtsi

@@ -67,6 +67,26 @@
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+			flash@1 {
+				reg = < 1 >;
+				compatible = "jedec,spi-nor";
+				status = "disabled";
+			};
+			flash@2 {
+				reg = < 2 >;
+				compatible = "jedec,spi-nor";
+				status = "disabled";
+			};
+			flash@3 {
+				reg = < 3 >;
+				compatible = "jedec,spi-nor";
+				status = "disabled";
+			};
+			flash@4 {
+				reg = < 4 >;
+				compatible = "jedec,spi-nor";
+				status = "disabled";
+			};
 		};
 
 		spi: spi@1e630000 {