net: dsa: Remove allocation of driver private memory

The drivers now allocate their own memory for private usage. Remove
the allocation from the core code.

Signed-off-by: Andrew Lunn <[e-mail]>
Acked-by: Florian Fainelli <[e-mail]>
Tested-by: Vivien Didelot <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/dsa.h

···
 	struct list_head	list;
 
 	enum dsa_tag_protocol	tag_protocol;
-	int			priv_size;
 
 	/*
 	 * Probing and setup.

net/dsa/dsa.c

···
 	/*
 	 * Allocate and initialise switch state.
 	 */
-	ds = devm_kzalloc(parent, sizeof(*ds) + drv->priv_size, GFP_KERNEL);
+	ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
 	if (ds == NULL)
 		return ERR_PTR(-ENOMEM);