staging: ks7010: Rename ks_wlan_set_multicast_list()

All of the net_device_ops callbacks are named after their counterparts
in the kernel's 'struct net_device_ops', except
ks_wlan_set_multicast_list().  Rename it to ks_wlan_set_rx_mode() for
greater consistency.

Signed-off-by: Quytelda Kahja <quytelda@tamalin.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>