fpga: Add support for getting external data address and length

This function supports getting both data address and length for
existing FPGA subimage and FPGA external data.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/cmd/fpga.c b/cmd/fpga.c
index 88a8e3f..b1f224b 100644
--- a/cmd/fpga.c
+++ b/cmd/fpga.c
@@ -343,9 +343,9 @@
 			return CMD_RET_FAILURE;
 		}
 
-		/* get fpga subimage data address and length */
-		if (fit_image_get_data(fit_hdr, noffset, &fit_data,
-				       &data_size)) {
+		/* get fpga subimage/external data address and length */
+		if (fit_image_get_data_and_size(fit_hdr, noffset,
+					       &fit_data, &data_size)) {
 			puts("Fpga subimage data not found\n");
 			return CMD_RET_FAILURE;
 		}