sdk: Remove most public sdk parts

* Remove droiddoc, it has been commented out since a few versions
* Remove API which hasn't work since a while
* Remove org.lineageos.platform.sdk library
* Remove samples
* Remove obsolete README

Change-Id: Ieb1c2a64ee04480a81d24cb782806397f64adb7d
42 files changed
tree: f332b57b6d9cc53491d9d941be11d837834456c5
  1. lib/
  2. lineage/
  3. packages/
  4. sdk/
  5. tests/
  6. .gitignore
  7. Android.bp
  8. CleanSpec.mk