ad9963: Remove localparams from module parameter list

Declaring local parameters in the module parameter list is not valid
verilog. For some reasons Vivado accepts it nevertheless so the code has
worked so far. But this is not true for other tools, so move the local
parameter definitions inside the module body.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

library/axi_ad9963/axi_ad9963_tx_channel.v

@@ -43,12 +43,8 @@ module axi_ad9963_tx_channel #(
 
   parameter   CHANNEL_ID = 32'h0,
   parameter   Q_OR_I_N = 0,
-  parameter   DATAPATH_DISABLE = 0,
-  localparam  PRBS_SEL = CHANNEL_ID,
-  localparam  PRBS_P09  = 0,
-  localparam  PRBS_P11  = 1,
-  localparam  PRBS_P15  = 2,
-  localparam  PRBS_P20  = 3) (
+  parameter   DATAPATH_DISABLE = 0
+) (
 
   // dac interface
 
@@ -80,6 +76,12 @@ module axi_ad9963_tx_channel #(
   output      [31:0]  up_rdata,
   output              up_rack);
 
+  localparam  PRBS_SEL = CHANNEL_ID;
+  localparam  PRBS_P09 = 0;
+  localparam  PRBS_P11 = 1;
+  localparam  PRBS_P15 = 2;
+  localparam  PRBS_P20 = 3;
+
   // internal registers
 
   reg             dac_valid_sel = 'd0;