Change android.permission.SERIAL_PORT to signature|system.
Change android.permission.SERIAL_PORT to signature|system.

Bug: 7367956
Change-Id: I0bc65936ba59c43c18d9a6ba52affff4c921f2fb

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