spl: fdt: Record load/entry fit-images entries in 64bit format

The commit 9f45aeb93727 ("spl: fit: implement fdt_record_loadable") which
introduced fdt_record_loadable() state there spl_fit.c is not 64bit safe.
Based on my tests on Xilinx ZynqMP zcu102 platform there shouldn't be a
problem to record these addresses in 64bit format.
The patch adds support for systems which need to load images above 4GB.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/common/image-fit.c b/common/image-fit.c
index d54eff9..c82d4d8 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -791,17 +791,18 @@
 		return -1;
 	}
 
-	if (len > sizeof(ulong)) {
-		printf("Unsupported %s address size\n", name);
-		return -1;
-	}
-
 	cell_len = len >> 2;
 	/* Use load64 to avoid compiling warning for 32-bit target */
 	while (cell_len--) {
 		load64 = (load64 << 32) | uimage_to_cpu(*cell);
 		cell++;
 	}
+
+	if (len > sizeof(ulong) && (uint32_t)(load64 >> 32)) {
+		printf("Unsupported %s address size\n", name);
+		return -1;
+	}
+
 	*load = (ulong)load64;
 
 	return 0;