CCodec: Episode V --- Encrypted Input Buffers

Handle encrypted input buffers.

Bug: 69376489
Test: adb shell setprop debug.stagefright.ccodec yes
Test: adb shell setprop debug.stagefright.omx_default_rank 1000
Test: adb shell killall mediaserver
Test: atest CtsMediaTestCases:MediaDrmClearkeyTest
Change-Id: Ife2ea39419366d8e8998614a72a30f05cd7c4c4d
(cherry picked from commit 25aec414)