Revert "Use prebuilt Runtime (Bionic) APEX and SDK."

Revert submission 1313238-bionic-prebuilt

Reason for revert: Broken host tests on linux_bionic.
Reverted Changes:
I0df9cba6f:Use prebuilt Runtime (Bionic) APEX and SDK.
I27b7d9133:Drop Bionic from the tree - should now use prebuil...
I8685a68c5:Add Runtime (Bionic) SDK and update mainline prebu...

Bug: 157549171
Change-Id: Ia076b912d76f217724bc568873d79d8211615d9f
3 files changed