ARM: dts: aspeed: ethanolx: Add BIOS flash chip

Add a BIOS flash chip to the DTS to open a possibility to reflash the
main CPU BIOS from the BMC.

Signed-off-by: Konstantin Aladyshev <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/boot/dts/aspeed-bmc-amd-ethanolx.dts

···
 	};
 };
 
+&spi1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_spi1_default>;
+	flash@0 {
+		status = "okay";
+		m25p,fast-read;
+		label = "bios";
+		spi-max-frequency = <100000000>;
+	};
+};
 
 &mac0 {
 	status = "okay";