Use "dpm force-security-logs" in security logging test.

This is to avoid relying on implementation details like
how big is batch notification level and how long is the
delay between log fetching.

Change-Id: Ic00da14ce214f4f6958d4fc098e573579f2853dd
Bug: 70886042
Test: cts-tradefed run cts -m CtsDevicePolicyManagerTestCases -t
  com.android.cts.devicepolicy.DeviceOwnerTest#testSecurityLoggingWithSingleUser
2 files changed