Replace the flags/hint arguments to bo_alloc{,_static} with a location mask.

Now, allocations only take locations, rather than a variety of unused flags.
The only interesting flag before was the no_move/no_evict pair for scanout
and similar buffers, which the DRI drivers don't use.  That will be readded
when we get to using this code for display buffer allocation, by adding a
pin/unpin call (dynamic pinning/unpinning may be useful for VT switching and
root window resizing).

This commit changes one instance of DRM_BO_FLAG_MEM_LOCAL with
DRM_BO_FLAG_MEM_TT, which appeared to have been unintentional.

src/mesa/drivers/dri/i915tex/intel_batchbuffer.c

@@ -102,8 +102,7 @@ intel_batchbuffer_reset(struct intel_batchbuffer *batch)
 
    batch->buf = dri_bo_alloc(intel->intelScreen->bufmgr, "batchbuffer",
 			     intel->intelScreen->maxBatchSize, 4096,
-			     DRM_BO_FLAG_MEM_TT |
-			     DRM_BO_FLAG_EXE, 0);
+			     DRM_BO_FLAG_MEM_TT);
    dri_bo_map(batch->buf, GL_TRUE);
    batch->map = batch->buf->virtual;
    batch->size = intel->intelScreen->maxBatchSize;