Revert "Initial support for proposed android.net.lowpan"

This reverts commit 4e0c2195.

Fixes: 64111427
Test: Grabbed OC CTS binaries
Test: Extracted android-cts.zip  and from android-cts/tools directory launched ./cts-tradefed
Test: On the DUT (running build which has this CL cherrypicked), ran the below (will run this test on both abi's):
Test: run cts -m CtsPermission2TestCases -t android.permission2.cts.PermissionPolicyTest#testPlatformPermissionPolicyUnaltered --skip-connectivity-check --skip-preconditions --serial <device serial>
Test: Note, while b/64111427 is fixed, this uncovered b/64560640

Change-Id: I1d2132678281a917f03c69d5ead1d28313d7f46d
Merged-In: Icab67ba2c40bc02968e3f8ed2da5a4a3be6cf77f