[PATCH 6/8] mmc: sdhci-of-aspeed: Add output timing phase tuning

[Cool Lee]

> > Enhance auto tuning with input and output calibration.
> >
> 
> Might be best to squash this into the patch with input phase tuning?
> Why split it?
Ok, I will do that. Just like to make the commit smaller.

> 
> Andrew