NIAP: Ignore BluetoothKeystoreServiceTest when the User is not primary.

Since the user can't switch user when NIAP is enabled. On the
premise, we don't need to do keystore unit test if the callingUser
is not primary. Will directly ignore it.

Bug: 157685060
Test: atest BluetoothInstrumentationTests
Tag: #stability

Change-Id: I6cf31b67a7fc01ae3ba8bced6a0bff6349257c9d
Merged-In: I6cf31b67a7fc01ae3ba8bced6a0bff6349257c9d