Function io_conformance_util::validate_vmo_rights

pub fn validate_vmo_rights(vmo: &Vmo, expected_vmo_rights: VmoFlags)

Asserts that the given vmo_rights align with the expected_vmo_rights passed to a get_backing_memory call. We check that the returned rights align with and do not exceed those in the given flags, that we have at least basic VMO rights, and that the flags align with the expected sharing mode.