When performing a C22 operation, check that the bus driver actually
provides the methods, and return -EOPNOTSUPP if not. C45 only busses
do exist, and in future their C22 methods will be NULL.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NMichael Walle <michael@walle.cc>
Signed-off-by: NJakub Kicinski <kuba@kernel.org>