ShellPkg/UefiShellAcpiViewCommandLib: Remove the variable "Index"

In IortParser.c ,the variable Index is set but not used in
function DumpIortNodeNamedComponent. This will cause build failure
when building ShellPkg with GCC.

Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Zhichao Gao <zhichao.gao@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>

ShellPkg/Library/UefiShellAcpiViewCommandLib/Parsers/Iort/IortParser.c

@@ -472,7 +472,6 @@ DumpIortNodeNamedComponent (
   )
 {
   UINT32 Offset;
-  UINT32 Index;
 
   Offset = ParseAcpi (
              TRUE,
@@ -485,7 +484,6 @@ DumpIortNodeNamedComponent (
 
   // Estimate the Device Name length
   PrintFieldName (2, L"Device Object Name");
-  Index = 0;
 
   while ((*(Ptr + Offset) != 0) &&
          (Offset < Length)) {