tests: cbfs: add Comp column to support coreboot utils > 4.6

The compression column was added in October 2017 / v4.7 by
https://review.coreboot.org/c/coreboot/+/22196/

 (0c2f0c1d31)

Signed-off-by: Marc Herbert <Marc.Herbert@gmail.com>

tests/comparators/test_cbfs.py

@@ -128,6 +128,7 @@ def test_listing(differences):
     assert differences[0].unified_diff in (
         get_data('cbfs_listing_expected_diff'),
         get_data('cbfs_listing_no_legacy_header_expected_diff'),
+        get_data('cbfs_listing_comp_column_expected.diff'),
     )
 
 

tests/data/cbfs_listing_comp_column_expected.diff

+@@ -1,3 +1,3 @@
+ Name                           Offset     Type           Size   Comp
+-text                           0x0        raw               446 none
+-(empty)                        0x200      null            32152 none
++text                           0x0        raw               671 none
++(empty)                        0x300      null            31896 none