modesetting: Allow CRTC transforms to actually take effect

Setting crtc->transformPresent to FALSE was preventing the transform
from actually taking effect and putting RandR into a confused state.

Now that the RandR 1.2 cursor code handles transforms correctly, we can
allow them to properly take effect.

Reviewed-by: Keith Packard <keithp@keithp.com>

hw/xfree86/drivers/modesetting/drmmode_display.c

@@ -373,7 +373,6 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
         crtc->x = x;
         crtc->y = y;
         crtc->rotation = rotation;
-        crtc->transformPresent = FALSE;
     }
 
     output_ids = calloc(sizeof(uint32_t), xf86_config->num_output);