cas: fix UAF in descrambler -- DO NOT MERGE
Change the plugin holder in both CasImpl and DescramblerImpl to shared_ptr, and use atomic store/load for read/write. bug: 73172817 Test:CTS MediaCasTest, VTS VtsHalCasV1_0Target, poc in bug Change-Id: I6b040680c28c38cef2fef3042f570dc64e86bb77
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