[BUG] Formalize definition of reset callback

[cujomalainey]

Describe the bug
Reset callback definition is not clear on the depth of a reset

/**                                                                                                                                                                                
 * Resets component.                                                                                                                                                               
 * @param dev Component device.                                                                                                                                                    
 */   

I have noticed many components treat this callback very differently

For example:

• DCB does nothing (maintains filter state)
• IIR removes everything including filter config
• volume does nothing (maintains config)

[cujomalainey]

@johnylin76 @singalsu FYI

[lgirdwood]

@singalsu can you take a look at this after v1.6.

[bkokoszx]

Hi @singalsu I'm just checking SOF 1.7 status. Were you able to take a look at this bug?

@lgirdwood Do we need it in 1.7?