MAINTAINERS: remove MACVLAN and VLAN entries

macvlan.c file seems to be both in VLAN and MACVLAN DRIVER, so remove
the MACVLAN DRIVER since this is redundant.

I propose with this patch to remove the VLAN (802.1Q) entry so this just
falls into the NETWORKING [GENERAL].

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>