IntelFsp2Pkg/Tools: Fixed PatchFv.py to parse new Fv map file format

IntelFsp2Pkg/Tools: Fixed PatchFv.py to parse new Fv map file format

The commit 76e8aac158b0717fa27f12e4d008f79161ddb050 changed Fv map format.
It added the image type to better support source level debug. But it broke
the function of PatchFv.py because PatchFv.py also consume Fv map file.

This patch is to update PatchFv.py to make it work again.

Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Yunhua Feng <fengyunhua@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>