Make STOP_APP_SWITCHES signatureOrSystem.
Make STOP_APP_SWITCHES signatureOrSystem.

The NFC service relies on this permission
for it's dispatching mechanism and it is
no longer signed with the platform cert.

Bug: 4173610
Change-Id: I598ad2889c4af307f04433093923255fe7daedbb

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base