BaseTools: Parse PCD GUID name in FILE statement issue

BaseTools: Parse PCD GUID name in FILE statement issue

FDF format as below:
FILE APPLICATION = PCD(PcdToken.PcdCName) {

}
when parse PCD, need get all PCDs from Platform and Packages,
use self.BuildObject[self.Platform, Arch] get some modules is wrong.
so use self.BuildObject[self.Platform, Arch, TargetName, ToolChainTag]
get all modules.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>