dashplayer: Send buffering start event conditionally

Send buffering start event to application only if
video decoder is instantiated.

Change-Id: I99465b45b2f68efbd40eada3d03a235bb6694223
Revert "mm-video: vidc: Add support for dynamic debug
logging"

This reverts commit 4129054ff17269d3a4a277398b922f4a18c73cd4
-This gerrit is causing the power regression (CR:552802).
After reverting this change we see improvement of ~79mA.
Even the CPU consumption of "VideoDecMsgThre" of
/system/bin/mediaserver came down.

Change-Id: Ia1947a02a8d4cc3bad528bdc0ac346f0f7d6af93
Merge "dashplayer: Send buffering start event conditionally"
Merge "Revert "mm-video: vidc: Add support for dynamic debug logging""
Merge branch 'jb_2.6_1' of git://codeaurora.org/quic/la/platform/hardware/qcom/media into android-4.3