staging: greybus: auto_manager: use default_groups in kobj_type

There are currently 2 ways to create a set of sysfs files for a
kobj_type, through the default_attrs field, and the default_groups
field.  Move the greybus audio code to use default_groups field which
has been the preferred way since aa30f47cf666 ("kobject: Add support for
default attribute groups to kobj_type") so that we can soon get rid of
the obsolete default_attrs field.

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

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