drm/amd/amdgpu: Enable gfxoff for beige_goby

Enable gfxoff in driver side based on SMC#73.3

v2: fix typo 'Eanble' --> 'Enable'

Signed-off-by: Chengming Gui <[e-mail]>
Reviewed-by: Tao Zhou <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

···
 	case CHIP_SIENNA_CICHLID:
 	case CHIP_NAVY_FLOUNDER:
 	case CHIP_DIMGREY_CAVEFISH:
+	case CHIP_BEIGE_GOBY:
 		amdgpu_gfx_off_ctrl(adev, enable);
 		break;
 	case CHIP_VANGOGH:

drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c

···
 	case CHIP_SIENNA_CICHLID:
 	case CHIP_NAVY_FLOUNDER:
 	case CHIP_DIMGREY_CAVEFISH:
+	case CHIP_BEIGE_GOBY:
 	case CHIP_VANGOGH:
 		if (!(adev->pm.pp_feature & PP_GFXOFF_MASK))
 			return 0;