UefiPayloadPkg: Remove unused variable to fix build error

Variable ChildBusAddress is not used in function ParsePciRootBridge, it
triggers build error on GCC version gcc version 13.3.0.

Remove this variable to fix build error.

Signed-off-by: Ajan Zhong <[email protected]>

Author: AjanZhong

UefiPayloadPkg/Library/FdtParserLib/FdtParserLib.c

@@ -841,21 +841,9 @@ ParsePciRootBridge (
       UINT32  TripletCells = ChildAddrCells + ParentAddrCells + SizeCells;
 
       for (Base = 0; Base < TempLen / sizeof (UINT32); Base = Base + TripletCells) {
-        UINT64  ChildBusAddress  = 0;
         UINT64  ParentBusAddress = 0;
         UINT64  DmaRangeSize     = 0;
-
-        if (ChildAddrCells == 3) {
-          ChildBusAddress = (UINT64)Fdt32ToCpu (*(Data32 + Base + 1)) << 32 |
-                            (UINT64)Fdt32ToCpu (*(Data32 + Base + 2));
-        } else if (ChildAddrCells == 2) {
-          ChildBusAddress = (UINT64)Fdt32ToCpu (*(Data32 + Base)) << 32 |
-                            (UINT64)Fdt32ToCpu (*(Data32 + Base + 1));
-        } else if (ChildAddrCells == 1) {
-          ChildBusAddress = Fdt32ToCpu (*(Data32 + Base));
-        }
-
-        UINT32  ParentBase = Base + ChildAddrCells;
+        UINT32  ParentBase       = Base + ChildAddrCells;
         if (ParentAddrCells == 2) {
           ParentBusAddress = (UINT64)Fdt32ToCpu (*(Data32 + ParentBase)) << 32 |
                              (UINT64)Fdt32ToCpu (*(Data32 + ParentBase + 1));