c0a7655834
(This is a merge of http://go/wvgerrit/25581) To prevent dead DRM Plugins from being instantiated when there are no sessions available, the time at which the device ID is queried has been moved from instantiation-time to SPOID-calculation-time. SPOIDs can now fail to be generated. Which means anything that depends on a SPOID may fail because of this. However, this is a more actionable problem for apps than having them receive a dead or unusable DRM Plugin object. Bug: 36660726 Test: libwvdrmdrmplugin_hidl_test Change-Id: Ice6a8eabfee8d48bf2af02e2e7169aa95af9f2e4