Merge "C2SoftMpeg4Enc: Do not return 0 byte CSD for H263" am: 386643fc4d am: ca5dfc3cc3 am: 4f587a02ca am: 31ec0f5cd3 am: 1c4cdc4caa

Original change: https://android-review.googlesource.com/c/platform/frameworks/av/+/1773666

Change-Id: If2ee3b97f1d612fe6290ca4c6a6c0f2cef224233