soundwire: sysfs: remove unneeded ATTRIBUTE_GROUPS() comments

Now that we manually created our own attribute group list, the outdated
ATTRIBUTE_GROUPS() comments can be removed as they are not needed at
all.

Cc: Vinod Koul <[e-mail]>
Cc: Bard Liao <[e-mail]>
Cc: Pierre-Louis Bossart <[e-mail]>
Cc: Sanyog Kale <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Reviewed-by: Dan Williams <[e-mail]>
Tested-By: Vijendar Mukunda <[e-mail]>
Link: https://lore.kernel.org/r/2024013031-tranquil-matador-a554@gregkh
Signed-off-by: Vinod Koul <[e-mail]>

drivers/soundwire/sysfs_slave.c

···
 	NULL,
 };
 
-/*
- * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
- * for device-level properties
- */
 static const struct attribute_group sdw_slave_dev_attr_group = {
 	.attrs	= slave_dev_attrs,
 	.name = "dev-properties",
···
 }
 DEFINE_SYSFS_GROUP_VISIBLE(dp0);
 
-/*
- * we don't use ATTRIBUTES_GROUP here since we want to add a subdirectory
- * for dp0-level properties
- */
 static const struct attribute_group dp0_group = {
 	.attrs = dp0_attrs,
 	.is_visible = SYSFS_GROUP_VISIBLE(dp0),