enable multiple type controls for single widget

[juimonen]

I was experimenting with beamformer with 2 controls (byte and enum) and
noticed this restriction: It seems that widget can have multiple controls but
they are inherently assumed to be of the same type. The alsa topology
documentation is a little bit hazy on this part...

The diff looks quite nasty and invasive, but it is only refactoring the kcontrol
creation/deletion to be based on type instead of just the topology chunk size.
Also it seems that these struct members I'm touching are not used too much
by anyone else than sof...

I tried this with eq by adding bytes and enum and it seemed to work.