Clone Persons field in ShortcutInfo only for app prediction

Persons field in ShortcutInfo should only be accessible when caller
has the MANAGE_APP_PREDICTIONS permission.

Bug: 123959894
Test: atest com.android.server.pm.ShortcutManagerTest1 \
  com.android.server.pm.ShortcutManagerTest2 \
  com.android.server.pm.ShortcutManagerTest3 \
  com.android.server.pm.ShortcutManagerTest4 \
  com.android.server.pm.ShortcutManagerTest5 \
  com.android.server.pm.ShortcutManagerTest6 \
  com.android.server.pm.ShortcutManagerTest7 \
  com.android.server.pm.ShortcutManagerTest8 \
  com.android.server.pm.ShortcutManagerTest9 \
  com.android.server.pm.ShortcutManagerTest10

Change-Id: I1908496dfbf9b11624b0746154bb5ea6f2d30c38