Grant VTS tests all permissions in keystore on userdebug/eng

Tests for bluetooth are being created. The test
is run as root and attempts various operations that directly
use the Keystore service. By default that test will not be
able to perform necessary actions such as creating keys for tests.

This change will enable the root user to perform all key
operations, but only on userdebug and eng builds.

Bug: 117993149
Test: Bluetooth tests pass

Change-Id: I7ac09562851a7dd8c275fd5606bbc99acb5f210e
Merged-In: Ic6eb5748e0e19b64a44c4bdf88a7074f7367db3d