qdMetadata: Add MetaData operation functions

1. Change frame rate to float since uint32_t can not
   match frame rate to standard.
2. Add function of getMetaData() for components to
   fetch params from MetaData.
2. Add function of CopyMetaData() for components to
   clone MetaData for different buffers.

Change-Id: Iba741215e524254b88f88058052fb6408e1f4a36
CRs-fixed: 1001500
2 files changed