RFR: 8333357: revert current mobile changes

[Johan Vos]

Revert mobile-specific changes that are in openjdk/mobile but not inpenjdk/jdk
This allows us to add new, clean commits that are in line with the recent changes in jdk and the requirements for ios/android ports.

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Commit messages:
 - Revert mobile-specific changes that are in openjdk/mobile but not in

Changes: https://git.openjdk.org/mobile/pull/25/files
  Webrev: https://webrevs.openjdk.org/?repo=mobile&pr=25&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333357
  Stats: 293 lines in 17 files changed: 123 ins; 154 del; 16 mod
  Patch: https://git.openjdk.org/mobile/pull/25.diff
  Fetch: git fetch https://git.openjdk.org/mobile.git pull/25/head:pull/25

PR: https://git.openjdk.org/mobile/pull/25