Have you tried AMD Support to see if that information is available to the public from here: Online Service Request | AMD . The will assign you a Embedded Specialist to help you if needed.
Here are the general spec for that Embedded GPU: AMD Radeon E9171 MCM Specs | TechPowerUp GPU Database
Sometimes you need to be "White listed" to have access to the Dev Guru and other developer/programmer Forums at AMD. Possibly Deepak might be able to assist you with this.