When the resolution is changed to small, does not reset the va context.
So it's ok when vaimage's resolution is larger then video's resolution.
OMXVideoDecoderBase: yami interface change

1. use setNativeDisplay for display handle
2. remove unused variable in VideoRenderBuffer
Enable setParameters/getParameters() with VideoParamsType.

Signed-off-by: Tang Xin <xin.t.tang@intel.com>