[board/{spec,svec,vfchd}] provide explicitely path to LM32 binary

This is done since the user must provide proper path as well

top/spec_ref_design/spec_wr_ref_top.vhd

@@ -416,6 +416,7 @@ begin  -- architecture top
     generic map (
       g_simulation                => 0,
       g_with_external_clock_input => TRUE,
+      g_dpram_initf               => "../../bin/wrpc/wrc_phy8.bram",
       g_fabric_iface              => ETHERBONE)
     port map (
       areset_n_i          => areset_n,

top/svec_ref_design/svec_wr_ref_top.vhd

@@ -348,6 +348,7 @@ begin  -- architecture top
   cmp_xwrc_board_svec : xwrc_board_svec
     generic map (
       g_with_external_clock_input => TRUE,
+      g_dpram_initf               => "../../bin/wrpc/wrc_phy8.bram",
       g_fabric_iface              => ETHERBONE)
     port map (
       clk_20m_vcxo_i      => clk_20m_vcxo_i,

top/vfchd_ref_design/vfchd_wr_ref_top.vhd

@@ -396,6 +396,7 @@ begin  -- architecture top
   cmp_xwrc_board_vfchd : xwrc_board_vfchd
     generic map (
       g_with_external_clock_input => TRUE,
+      g_dpram_initf               => "../../bin/wrpc/wrc_phy8.mif",
       g_fabric_iface              => ETHERBONE)
     port map (
       clk_board_125m_i  => clk_board_125m_i,