staging: greybus: Avoid abusing controls_rwsem

The controls_rwsem of snd_card object is rather an internal lock, and
not really meant to be used by others for its data protection.

This patch addresses it by replacing the controls_rwsem usages with
the own (new) mutex.

Note that the up_write() and down_write() calls around
gbaudio_remove_component_controls() are simply dropped without
replacement.  These temporary up/down were a workaround since
gbaudio_remove_component_controls() itself took the rwsem.  Now it was
also gone, we can clean up the workaround, too.

Acked-by: Greg Kroah-Hartman <[email protected]>
Cc: Vaibhav Agarwal <[email protected]>
Cc: Mark Greer <[email protected]>
Cc: Johan Hovold <[email protected]>
Cc: Alex Elder <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>

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