staging: ks7010: use ether_addr_copy in hostif_sme_multicast_set

Use ether_addr_copy to copy ethernet addresses in function
hostif_sme_multicast_set instead of memcpy.

Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>