xilinx: zynqmp: Generate different u-boot.itb for MULTI_DTB_FIT

When MULTI_DTB_FIT is enabled fit-dtb.blob fit image is created which
contain all DTBs listed by CONFIG_OF_LIST. And with DTB_RELESELECT there is
a need to handle it as one file with DTBs in it not as separate DTBs in
u-boot.its/itb.
That's why extend mkimage_fit_atf.sh to generate u-boot.itb correctly.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

arch/arm/mach-zynqmp/mkimage_fit_atf.sh

@@ -111,6 +111,51 @@ cat << __TEE
 __TEE
 fi
 
+MULTI_DTB=`awk '/CONFIG_MULTI_DTB_FIT / { print $3 }' include/generated/autoconf.h`
+
+if [ 1"$MULTI_DTB" -eq 11 ]; then
+	cat << __FDT_IMAGE_EOF
+		fdt_1 {
+			description = "Multi DTB fit image";
+			data = /incbin/("fit-dtb.blob");
+			type = "flat_dt";
+			arch = "arm64";
+			compression = "none";
+			$DTB_LOAD
+			hash {
+				algo = "md5";
+			};
+		};
+	};
+	configurations {
+		default = "config_1";
+__FDT_IMAGE_EOF
+
+if [ ! -f $BL31 ]; then
+cat << __CONF_SECTION1_EOF
+		config_1 {
+			description = "Multi DTB without TF-A";
+			firmware = "uboot";
+			loadables = "fdt_1";
+		};
+__CONF_SECTION1_EOF
+else
+cat << __CONF_SECTION1_EOF
+		config_1 {
+			description = "Multi DTB with TF-A";
+			firmware = "atf";
+			loadables = "uboot", "fdt_1";
+		};
+__CONF_SECTION1_EOF
+fi
+
+cat << __ITS_EOF
+	};
+};
+__ITS_EOF
+
+else
+
 DEFAULT=1
 cnt=1
 for dtname in $DT
@@ -181,3 +226,5 @@ cat << __ITS_EOF
 	};
 };
 __ITS_EOF
+
+fi