Update GenFv tool to handle the file path with space.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gao, Liming liming.gao@intel.com
Review-by: Kinney, Michael D michael.d.kinney@intel.com

git-svn-id: https://svn.code.sf.net/p/edk2-buildtools/code/trunk/BaseTools@2674 c2973edb-eda0-4c78-bc6a-9341b269661f