add shell user allowlist perms for Asistant GTS

Origional changes were in aosp/1546877. It has a merged-in referencing
ag/13319676, but ag/13319676 doesn't contain these changes. This CL is
to add the missing changes.

Bug: 177271291
Test: gts-tradefed run gts -m GtsAssistIntentTestCases
Change-Id: I22a3e6a3475263ec4e007e37412a269ca95c8bbe