rockchip: Enable building a SPI ROM image on jerry

Add a simple binman config and enable CONFIG_HAS_ROM so that U-Boot
produces a ROM for jerry.

Change the binman image definition to support multiple images, since it
may be used to build both u-boot-rockchip.bin and u-boot.rom

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/dts/rk3288-u-boot.dtsi b/arch/arm/dts/rk3288-u-boot.dtsi
index 51b6e01..c87f001 100644
--- a/arch/arm/dts/rk3288-u-boot.dtsi
+++ b/arch/arm/dts/rk3288-u-boot.dtsi
@@ -12,6 +12,30 @@
 	};
 };
 
+#ifdef CONFIG_ROCKCHIP_SPI_IMAGE
+&binman {
+	rom {
+		filename = "u-boot.rom";
+		size = <0x400000>;
+		pad-byte = <0xff>;
+
+		mkimage {
+			args = "-n rk3288 -T rkspi";
+			u-boot-spl {
+			};
+		};
+		u-boot-img {
+			offset = <0x20000>;
+		};
+		u-boot {
+			offset = <0x300000>;
+		};
+		fdtmap {
+		};
+	};
+};
+#endif
+
 &dmc {
 	u-boot,dm-pre-reloc;
 };
diff --git a/arch/arm/dts/rockchip-u-boot.dtsi b/arch/arm/dts/rockchip-u-boot.dtsi
index a2559e2..0451db7 100644
--- a/arch/arm/dts/rockchip-u-boot.dtsi
+++ b/arch/arm/dts/rockchip-u-boot.dtsi
@@ -6,7 +6,13 @@
 #include <config.h>
 
 / {
-	binman {
+	binman: binman {
+		multiple-images;
+	};
+};
+
+&binman {
+	simple-bin {
 		filename = "u-boot-rockchip.bin";
 		pad-byte = <0xff>;