A Maywood man has been sentenced to four years and eight months in prison in connection with a DUI crash into a Downey home that left a 73-year-old grandmother dead and injured her granddaughter as they slept, the Los Angeles County District Attorney’s Office said Friday. Ryan Mota, now 25, pleaded no contest Thursday to one count each of gross vehicular manslaughter while intoxicated and driving under the influence of alcohol with a blood-alcoh…