It is useful to know if we are the only master on a given bus. Because
this is a HW description of the bus, add it to the generic bindings.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>