[prim_subreg_shadow] Correct write data signal usage

Signed-off-by: Michael Schaffner <msf@google.com>
diff --git a/hw/ip/prim/rtl/prim_subreg_shadow.sv b/hw/ip/prim/rtl/prim_subreg_shadow.sv
index 6976419..5c4a5f8 100644
--- a/hw/ip/prim/rtl/prim_subreg_shadow.sv
+++ b/hw/ip/prim/rtl/prim_subreg_shadow.sv
@@ -100,7 +100,7 @@
     .clk_i    ( clk_i     ),
     .rst_ni   ( rst_ni    ),
     .we       ( staged_we ),
-    .wd       ( ~wd       ),
+    .wd       ( ~wr_data  ),
     .de       ( staged_de ),
     .d        ( ~d        ),
     .qe       ( staged_qe ),
@@ -144,7 +144,7 @@
     .clk_i    ( clk_i        ),
     .rst_ni   ( rst_ni       ),
     .we       ( committed_we ),
-    .wd       ( wd           ),
+    .wd       ( wr_data      ),
     .de       ( committed_de ),
     .d        ( d            ),
     .qe       ( committed_qe ),