NET: ROSE: Convert ROSE device creation to netlink.

ROSE does not yet support configuration via netlink and the old ioctl
way of doing things has its limitations as rose addresses are longer than
eight bytes:

  # ifconfig rose0 hw rose 1234567890
  # ifconfig rose0
  rose0: flags=128<NOARP>  mtu 249
          rose 12345678ff  txqueuelen 1  (AMPR ROSE)
          RX packets 0  bytes 0 (0.0 B)
          RX errors 0  dropped 0  overruns 0  frame 0
          TX packets 0  bytes 0 (0.0 B)
          TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

That is, ifconfig was returning an incorrect last byte of the address.

Until now, ROSE did create a number of ROSE devices on initialization.
The number could be set by the module parameter rose_ndevs and did
default to 10 while typically only a single one would be used.

With this applied a new version of ip from the iproute2 is required for
ROSE device creation:

  # ip link add type rose

This will create a ROSE device which will be named rose0 for the first
device thus consistent with the old naming practice.  Explicit naming
is possible with

  # ip link add name pink17 type rose

which will create a ROSE device named pink17.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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