Add ARCH, FAMILY, TOOL_CHAIN_TAG, TARGET as highest priority macros which can be used in FDF and DSC file.
Add ARCH, FAMILY, TOOL_CHAIN_TAG, TARGET as highest priority macros which can be used in FDF and DSC file.

Signed-off-by: yingke
Reviewed-by: jsu1

git-svn-id: f3880c1fc5096ce2109c8aec392d8e07f619f417@2479 c2973edb-eda0-4c78-bc6a-9341b269661f

tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,bitcrystal/buildtools-BaseTools,tianocore/buildtools-BaseTools,tianocore/buildtools-BaseTools