rockchip: rk3399-gru: Include binman generated FIT in u-boot.rom image

The u-boot.rom image contain u-boot.img FIT instead of the FIT generated
by binman for the u-boot-rockchip.bin image.

Change to include the binman generated FIT for the u-boot.rom image.

This change result in TF-A being included and the use sha256 instead of
crc32 checksum in the u-boot.rom FIT.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/dts/rk3399-u-boot.dtsi b/arch/arm/dts/rk3399-u-boot.dtsi
index bd7527d..70f35b6 100644
--- a/arch/arm/dts/rk3399-u-boot.dtsi
+++ b/arch/arm/dts/rk3399-u-boot.dtsi
@@ -50,7 +50,9 @@
 			u-boot-spl {
 			};
 		};
-		u-boot-img {
+		fit {
+			type = "blob";
+			filename = "u-boot.itb";
 			offset = <CONFIG_SYS_SPI_U_BOOT_OFFS>;
 		};
 		u-boot {