ARM: dts: aspeed: Add SPI controller bindings to Romulus

Romulus systems have one MX25L25635 (32768 Kbytes) flash module for
the BMC firmware and other MT25QL512A (65536 Kbytes) for the host.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/aspeed-bmc-opp-romulus.dts

@@ -31,6 +31,25 @@ vga_memory: framebuffer@bf000000 {
 	};
 };
 
+&fmc {
+	status = "okay";
+	flash@0 {
+		status = "okay";
+		label = "bmc";
+	};
+};
+
+&spi1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_spi1_default>;
+
+	flash@0 {
+		status = "okay";
+		label = "pnor";
+	};
+};
+
 &uart5 {
 	status = "okay";
 };