Changed logic for gathering dtb list to just use a wildcard for boards
that we're interested in.
Changed generate_chromebook_its.sh logic to just take in scattered dtb
files.
Compressed all input files that go into the .its
Here are some comparisons:
none: 37M
lz4: 17M < chosen in this commit
lzma: ~10M but boots 1 second slower
Since it's compressed the .its now had to include external compatible
properties, used `fdtget .dtb / compatible`.