mm-video:vdec: Video decoder bring-up on 8x55 target

- Set TILE color format for index zero on video port format
- Add ION memory support for video decoder.

Change-Id: Ifef1a15ec7089702c7644fd0e7c1463f81035fc7

Conflicts:
	mm-video/vidc/vdec/src/omx_vdec.cpp