BaseTools: include variable namespace GUIDs of HII PCDs in Guid.xref
BaseTools: include variable namespace GUIDs of HII PCDs in Guid.xref

[PcdsDynamicHii]
gFooTokenSpaceGuid.PcdBar|L"Variable"|gVarNameSpaceGuid|0x0|FALSE|NV,BS

This patch add the variable namespace GUIDs in "Guid.xref" that are
used with dynamic HII PCDs.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=452
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zhiju.Fan <fdd95dd62d41cb6d1628623e2b008c48ac56856d@intel.com>
Reviewed-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>

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