BaseTools/GenFds: remove MacroDict parameter

The MacroDict parameter goes around in circles through 4 functions without use.
1. GetSectionData calls into GetLeafSection, otherwise doesn?t use MacroDict
2. GetLeafSection calls into GetFileStatement, otherwise doesn?t use MacroDict
3. GetFileStatement calls into GetFilePart, otherwise doesn?t use MacroDict
4. GetFilePart calls into GetSectionData, otherwise doesn?t use MacroDict
	Go to 1 and repeat forever.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>