MLK-21037 update copyright for imx-gst1.0-plugins package

Copyright update to LGPL license in following files:
tools/gplay/playengine.c
tools/gplay/playengine.h

Copyrights updated to 2019 in following files:
tools/gplay2/gplay2.c
plugins/aiurdemux/aiurdemux.c

Signed-off-by: Haihua Hu <jared.hu@nxp.com>
4 files changed