[FEATURE] Make dai.c generic and move DAI specific code into DAI drivers.

[lgirdwood]

Is your feature request related to a problem? Please describe.
dai.c contains programming code for ssp, hda etc, this IP specific code should be in the dai driver and not the DAI core.

Describe the solution you'd like
Move all DAI specific logic to dai drivers.

[lgirdwood]

@RanderWang any progress here ?

[mengdonglin]

@lgirdwood Now the SSP specific code is in https://github.com/thesofproject/sof/blob/master/src/drivers/intel/ssp/ssp.c
and HDA spefic code is in https://github.com/thesofproject/sof/blob/master/src/drivers/intel/hda/hda.c

In dai.c, only function dai_config() has some type-specific logic https://github.com/thesofproject/sof/blob/master/src/audio/dai.c#L759

Do you think we need to modify this part? There is some Freescale code involved. If yes, can we push out this feature to V1.7 as now we should be feature freeze for V1.6.

[lgirdwood]

@mengdonglin Ok, lets push into v.1.7 @dbaluta fyi some imx parts also need moved.

[paulstelian97]

@lgirdwood Should I also take care of moving the i.MX parts from there in my existing PR #3368 or that is worth a new separate one?

[lgirdwood]

@paulstelian97 It's probably best if this was done atomically in one PR - we can do for v1.7

[paulstelian97]

@paulstelian97 It's probably best if this was done atomically in one PR - we can do for v1.7

Fair enough.

[lgirdwood]

@paulstelian97 any update ?

[paulstelian97]

In the backlog, might try to sprint it these days if I get a bit of extra time (right now trying to update Xtensa compiler for i.MX platforms).