net: mscc: ocelot: rename module to mscc_ocelot

mscc_ocelot is a slightly better name for a module than ocelot_board or
ocelot_vsc7514 is, so let's use that.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>