Remove all non-Apache2 licensed files from sdk

Remove MODULE_LICENSE_APACHE2

Repositories containing third-party code need a METADATA and a
license_type. Repositories containing only first-party code no longer
need a MODULE_LICENSE_* file.

Remove EPL-licensed eclipse plugin and attribute_stats.
Remove CC-BY-SA licensed typos files.

Bug: 68860345
Bug: 69058154
Bug: 151953481

Test: treehugger
Test: https://android-build.googleplex.com/builds/forrest/run/L63500000550775268

Exempt-From-Owner-Approval: janitorial work
Change-Id: I5fafa76de21fb0b46c82a2c07ac048afbee3df25
1805 files changed