Create bedstead-flags module. This allows flag checking with DeviceState rather than having an additional test rule (which is currently incompatible with DeviceState if bedstead-permissions is used) Test: btest a.d.c.BackupTest Test: btest a.d.c.SetUsbDataSignalingTest Test: btest a.d.i.DumpSysTest Test: atest bedstead-flags-test Change-Id: Ieb71840537b10050179843c2f417c80d0bf52158