Reintegrate fix that should have been captured in the squash merge 20…

…6e956

src/soc_ifc/rtl/soc_ifc_top.sv

@@ -959,7 +959,7 @@ always_comb soc_ifc_reg_hwif_in.CPTRA_DBG_MANUF_SERVICE_REG.DATA.we = cptra_unco
 always_comb soc_ifc_reg_hwif_in.CPTRA_DBG_MANUF_SERVICE_REG.DATA.next = cptra_uncore_dmi_reg_wdata;
 
 //DMI register read mux
-always_comb cptra_uncore_dmi_reg_rdata_in = ({32{(cptra_uncore_dmi_reg_addr == DMI_REG_MBOX_DLEN)}} & {31'b0, mbox_dmi_reg.MBOX_DLEN}) | 
+always_comb cptra_uncore_dmi_reg_rdata_in = ({32{(cptra_uncore_dmi_reg_addr == DMI_REG_MBOX_DLEN)}} & mbox_dmi_reg.MBOX_DLEN) | 
                                             ({32{(cptra_uncore_dmi_reg_addr == DMI_REG_MBOX_DOUT)}} & mbox_dmi_reg.MBOX_DOUT) | 
                                             ({32{(cptra_uncore_dmi_reg_addr == DMI_REG_MBOX_STATUS)}} & mbox_dmi_reg.MBOX_STATUS) | 
                                             ({32{(cptra_uncore_dmi_reg_addr == DMI_REG_BOOT_STATUS)}} & soc_ifc_reg_hwif_out.CPTRA_BOOT_STATUS.status.value) |