Added IEEE.NUMERIC_STD.ALL needed for unsigned().

libraries/io/ddr/src/vhdl/io_ddr_driver_flush_ctrl.vhd

@@ -22,6 +22,7 @@
 
 LIBRARY IEEE, common_lib, dp_lib;
 USE IEEE.STD_LOGIC_1164.ALL;
+USE IEEE.NUMERIC_STD.ALL;
 USE common_lib.common_pkg.ALL;
 USE dp_lib.dp_stream_pkg.ALL;