sound: make all 'class' structures const

Now that the driver core allows for struct class to be in read-only
memory, making all 'class' structures to be declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at load time.

Cc: Jaroslav Kysela <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: Ivan Orlov <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Geoff Levand <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: "Uwe Kleine-König" <[email protected]>
Cc: [email protected]
Suggested-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Ivan Orlov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

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