ARM: dts: aspeed: mtjade: Enable secondary flash

Enable the secondary flash of the Ampere's Mt. Jade's BMC.
Signed-off-by: NQuan Nguyen <quan@os.amperecomputing.com>
Signed-off-by: NThang Q. Nguyen <thang@os.amperecomputing.com>
Reviewed-by: NJoel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20220228000242.1884-2-quan@os.amperecomputing.comSigned-off-by: NJoel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-ampere-mtjade.dts

@@ -362,6 +362,13 @@
 		/* spi-max-frequency = <50000000>; */
 #include "openbmc-flash-layout-64.dtsi"
 	};
+
+	flash@1 {
+		status = "okay";
+		m25p,fast-read;
+		label = "alt-bmc";
+#include "openbmc-flash-layout-64-alt.dtsi"
+	};
 };
 
 &spi1 {