IntelFsp2Pkg: Add YAML file generation support

IntelFsp2Pkg: Add YAML file generation support

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3091

Add support for YAML format file generation in addition
to current BSF structure. Configuration of YAML format
output will be supported by an open source ConfigEditor.

Reference to YAML code, test and ConfigEditor is at
https://github.com/joshloo/fsp_yaml_cfg/tree/master/Tools

A unit test is also added in Tests folder. This test compares
the generated yaml file against the expected output to know
if it is constructing the yaml data structure as expected.

Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Signed-off-by: Loo Tung Lun <tung.lun.loo@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>