staging: use eth_hw_addr_set() for dev->addr_len cases

Convert all staging drivers from memcpy(... dev->addr_len)
to eth_hw_addr_set():

  @@
  expression dev, np;
  @@
  - memcpy(dev->dev_addr, np, dev->addr_len)
  + eth_hw_addr_set(dev, np)

Manually confirmed these are all etherdevices.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Link: https://lore.kernel.org/r/20211019171243.1412240-4-kuba@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>