Define a utility macro for defining capabilities and their attributes.
Capability attributes are read-only, write-only, read-write.
Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
