Added support for the following chipsets:

ATI MOBILITY RADEON HD 4330
ATI MOBILITY RADEON HD 4530
ATI MOBILITY RADEON HD 4570
ATI MOBILITY Radeon HD 4650
ATI MOBILITY Radeon HD 4670
ATI MOBILITY Radeon HD 4830
ATI MOBILITY Radeon HD 4850
ATI MOBILITY Radeon HD 4860
ATI MOBILITY Radeon HD 4870
ATI MOBILITY Radeon HD 4870 X2