ALSA: oxfw: gather model-dependent conditions to a function

Adding control elements is just for models supported by old
firewire-speakers modules. The processing should be in a function to add
model-dependent quirk.

This commit moves the codes to the function. As a result, the function
should handle error state, thus this commit also changes prototype of
the function.

Signed-off-by: Takashi Sakamoto <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>

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