virgl/gbm: add plane parameter to gbm_bo_map
Minigbm's gbm_bo_map signature has diverged from gbm. Update to minigbm signature, since virglrenderer now explicitly targets minigbm.
Minigbm's gbm_bo_map signature has diverged from gbm. Update to minigbm signature, since virglrenderer now explicitly targets minigbm.