rockchip: Add SPL into the main FIT

VBE may want to load the SPL image from the same FIT as contains U-Boot,
if there is enough memory, so add it.

Changes in v2:
- Move VPL things into a separate file

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rockchip-vpl-u-boot.dtsi

@@ -29,3 +29,32 @@
 		};
 	};
 };
+
+&binman {
+	template-1 {
+		images {
+			spl {
+				description = "U-Boot SPL";
+				type = "firmware";
+				os = "u-boot";
+				arch = ARCH;
+				compression = "lz4";
+				load = <CONFIG_SPL_TEXT_BASE>;
+				entry = <CONFIG_SPL_TEXT_BASE>;
+				phase = "spl";
+				section {
+					compress = "lz4";
+					u-boot-spl-nodtb {
+					};
+					u-boot-spl-bss-pad {
+					};
+				};
+			};
+		};
+		configurations {
+			@config-SEQ {
+				fit,firmware = "atf-1", "u-boot", "spl";
+			};
+		};
+	};
+};