Fix for 5247764 profile and level settings are not always correctly set

Correct video bitrate value is set from 3gpReader node.
Also, bitrate is limited to max supported by encoder as
per profile and level.

This patch also fixes bug
 5309520 [Prime] Native crash while running CTS test testExportEffectOverlay.

Change-Id: Icd649c02465e88553b6e69ea8bcd01baf66ded9e