dexoptanalyzer: fix --validate_bcp

Additional checks for validating boot classpath extensions:
- Check there are images covering all of the boot classpath.
- Add IsValid() checks to .oat and .vdex files.

Bug: 180950875
Test: manually corrupting artifacts from odrefresh and checking
Change-Id: Iccbee47ca63717aec5c8d065689c8851cf66cd61
1 file changed