[ActivityManager] Fix process record leakage.

Symptom:
Remain dead process record in mLruProcesses.

Root cause:
When a process dies and needs to restart immediately.
The process record will not be removed from mLruProcesses
in handleAppDiedLocked (return kept=true).
If the restarting process start timeout, the record in
mLruProcesses will not be removed.

Solution:
Call removeLruProcessLocked in processStartTimedOutLocked.

Change-Id: I1935ccc586016cb4e90dfdfac96cc88931553d5f

services/core/java/com/android/server/am/ActivityManagerService.java

@@ -6018,6 +6018,7 @@ public final class ActivityManagerService extends ActivityManagerNative
             // Take care of any services that are waiting for the process.
             mServices.processStartTimedOutLocked(app);
             app.kill("start timeout", true);
+            removeLruProcessLocked(app);
             if (mBackupTarget != null && mBackupTarget.app.pid == pid) {
                 Slog.w(TAG, "Unattached app died before backup, skipping");
                 try {