mm-video-v4l2: venc: Squash below changes

mm-video-v4l2: venc: Protect buffer from being freed while accessing
Change-Id: I6141e81d7dbd50bc3601c8df066fd8cbd06b4e0b

mm-video-v4l2: Protect buffer lifecycle with lock
Change-Id: I0fdb4051c94044e032c257febbe2ba1c7e4d6c7e

mm-video-v4l2: venc: Avoid buffer access after free
Change-Id: Id439aac54ee64a65ea68b6431a9f5150255a6980

mm-video-v4l2: venc: Use client allocated memory if available
Change-Id: I45e4f117e98588ee7c888ec5c1cb2424bc7e5fa3

mm-video-v4l2: Avoid buffer access after free buffer call
Change-Id: Ifde8d4e170b8dbeb9f7485d0222b05c3b2a960f3

Bug:62452543 Bug:36130225 Bug:64750179
CRs-Fixed: 2062772, 2106434, 2106434, 2115779

Test: cts-tradefed run cts -m CtsMediaTestCases and CtsCameraTestCases
Change-Id: Ifde8d4e170b8dbeb9f7485d0222b05c3b2a960f3