BaseTools: Fix a bug for different FV use same FILE statement Guid

BaseTools: Fix a bug for different FV use same FILE statement Guid

We meet a case that different FV use same FILE statement Guid, but the
FILE content is different. current we use the Guid value as Ffs file
dir which cause the ffs file will be override. This patch use Guid
value and Fv name as ffs dir for FILE statement.

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