devlink: Add helper functions for name and value separately

devlink: Add helper functions for name and value separately

Add a new helper functions which outputs only values (without name
label) for different types: boolean, uint, uint64, string and binary.
In addition add a helper function which prints only the name label.

Signed-off-by: Aya Levin <ayal@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David Ahern <dsahern@gmail.com>