codec2: read codec capabilities for c2.* components

Test: adb push frameworks/av/media/libstagefright/data/media_codecs_google_c2_*.xml /etc/
Test: adb push frameworks/av/media/libstagefright/data/media_codecs_google_c2.xml /etc/media_codecs_c2.xml
Test: setprop debug.stagefright.ccodec yes
Test: killall mediaserver
Test: cts-tradefed run cts -m CtsMediaTestCases -t android.media.cts.MediaCodecListTest
Change-Id: I131164a6c210cbafc1f989b22c56eebb1560d860