Ignore permission and permission-group in ephemeral apps

Ephemeral apps should not be defining permissions or groups that can be
seen on impact the rest of the system. They are ignored instead of
treated as an error to allow installed ephemeral apps to include them.

Test: Verified that permissions and permission-groups are ignored for
adb install --ephemeral

Change-Id: If5a3fee09916d12de7f6a1bc153937bf278f0360