net: mscc: ocelot: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix a warning
by explicitly adding a break statement instead of just letting the code
fall through to the next case.

Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Reviewed-by: Vladimir Oltean <[e-mail]>
Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/mscc/ocelot_vcap.c

···
 			vcap_key_bytes_set(vcap, &data, VCAP_IS1_HK_ETYPE,
 					   etype.value, etype.mask);
 		}
+		break;
 	}
 	default:
 		break;