netdevice: demote the type of some dev_addr_set() helpers

__dev_addr_set() and dev_addr_mod() and pretty low level,
let the arguments be void, there's no chance for confusion
in callers converted to use them. Keep u8 in dev_addr_set()
because some of the callers are converted from a loop
and we want to make sure assignments are not from an array
of a different type.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

include/linux/netdevice.h

@@ -4643,7 +4643,7 @@ void __hw_addr_init(struct netdev_hw_addr_list *list);
 
 /* Functions used for device addresses handling */
 static inline void
-__dev_addr_set(struct net_device *dev, const u8 *addr, size_t len)
+__dev_addr_set(struct net_device *dev, const void *addr, size_t len)
 {
 	memcpy(dev->dev_addr, addr, len);
 }
@@ -4655,7 +4655,7 @@ static inline void dev_addr_set(struct net_device *dev, const u8 *addr)
 
 static inline void
 dev_addr_mod(struct net_device *dev, unsigned int offset,
-	     const u8 *addr, size_t len)
+	     const void *addr, size_t len)
 {
 	memcpy(&dev->dev_addr[offset], addr, len);
 }