staging: ks7010: use ether_addr_copy in hostif_mib_get_confirm

This commit improves readability changing custom ethernet
addresses copies in favour of using ether_addr_copy() function.

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