ptp: Fix parameter name

Signed-off-by: Alex Forencich <alex@alexforencich.com>

src/ptp/rtl/taxi_ptp_td_phc_apb.sv

@@ -266,7 +266,7 @@ always_ff @(posedge ptp_clk) begin
 end
 
 logic s_apb_pready_reg = 1'b0;
-logic [AXIL_DATA_W-1:0] s_apb_prdata_reg = '0;
+logic [APB_DATA_W-1:0] s_apb_prdata_reg = '0;
 
 assign s_apb.pready = s_apb_pready_reg;
 assign s_apb.prdata = s_apb_prdata_reg;