Change to ARM's naming convention in DriverDetails.
This matches how ARM handles their naming in their drivers for different models.
Really it's that way because both Mali-T6xx and Mali-T7xx fall under Midgard.
While everything else (except Mali-55) fall under Utgard.
Merge pull request #286 from Sonicadvance1/ARM-naming

Change to ARM's naming convention in DriverDetails.