Remove meaningless parameter in IActivityTaskManager#setLockScreenShown

After ag/5760456, we can remove the parameter secondaryDisplaysShowing
since it becomes meaningless.

Fix: 123373363
Test: atest ActivityManagerMultiDisplayTests
      atest ActivityManagerDisplayKeyguardTests
      atest ActivityManagerDisplayLockedKeyguardTests
      atest KeyguardTests

Change-Id: I5ab5753985bc570bb730b4c7f801cdc263cc1858
7 files changed