[NET]: NETCONSOLE must depend on INET

NETCONSOLE=y and INET=n results in the following compile error:

net/built-in.o: In function `netpoll_parse_options':
: undefined reference to `in_aton'
net/built-in.o: In function `netpoll_parse_options':
: undefined reference to `in_aton'

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>