Explicitly allow shell to update listener/assist

Oddly, this was flaky; sometimes shell could update
the entries

Fixes: 63793946
Test: cts
cts-tradefed run cts-dev --module DevicePolicyManager
--test com.android.cts.devicepolicy.ManagedProfileTest
cts-tradefed run cts-dev --module DevicePolicyManager --test
com.android.cts.devicepolicy.ManagedProfileTest
cts-tradefed run cts-dev --module DevicePolicyManager
--test com.android.cts.devicepolicy.ManagedProfileTest

Change-Id: I5cc6d6a49ad083e68cac1717f97b025966619102