devlink: Increase bus, device buffer size to 64 bytes

devlink: Increase bus, device buffer size to 64 bytes

Device name on mdev bus is 36 characters long which follow standard uuid
RFC 4122.
This is probably the longest name that a kernel will return for a
device.

Hence increase the buffer size to 64 bytes.

Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>