fdf_parser.py: support SECTION COMPRESS sections

[apop5]

Previously, the FDF parser would fail to parse an FDF file with statements containing a SECTION COMPRESS with additional with nested sub sections.

Below is an example of a statement the parser failed to parser:

FILE RAW = <guid> {
    SECTION COMPRESS {
      SECTION RAW = $(OUTPUT_DIRECTORY)/$(TARGET)_$(TOOL_CHAIN_TAG)/FV/8C3D856A-9BE6-468E-850A-24F7A8D38E08.bin
    }
}

This PR updates the parser to be able to get past the parsing of the this, by checking there is an equal in the statement line, and pass it.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.39%. Comparing base (ce85203) to head (8ca0480).
Report is 120 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #654      +/-   ##
==========================================
- Coverage   81.43%   81.39%   -0.05%     
==========================================
  Files          56       45      -11     
  Lines        7514     7491      -23     
==========================================
- Hits         6119     6097      -22     
+ Misses       1395     1394       -1     

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[Javagedes]

Looks fine to me. We need a test though :)