MdeModulePkg CapsuleApp: Fix VS2012 build failure caused by 5410502

MdeModulePkg CapsuleApp: Fix VS2012 build failure caused by 5410502

The build failure is like below.
xxx\CapsuleApp.c(868) : error C2275: 'EFI_GUID' :
  illegal use of this type as an expression
        xxx/UefiBaseType.h(29) : see declaration of 'EFI_GUID'
xxx\CapsuleApp.c(868) : error C2146: syntax error :
  missing ';' before identifier 'ImageTypeId'
xxx\CapsuleApp.c(868) : error C2065: 'ImageTypeId' : undeclared identifier
xxx\CapsuleApp.c(869) : error C2275: 'UINTN' :
  illegal use of this type as an expression
        xxx\ProcessorBind.h(224) : see declaration of 'UINTN'
xxx\CapsuleApp.c(869) : error C2146: syntax error :
  missing ';' before identifier 'ImageIndex'
xxx\CapsuleApp.c(869) : error C2065: 'ImageIndex' : undeclared identifier

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>