staging: ks7010: use ether_addr_copy in ks_wlan_set_mac_address

Use ether_addr_copy to copy ethernet address instad of using
memcpy in ks_wlan_set_mac_address function.

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