zink: use internal map flag for qbos

DONTBLOCK is sort of almost good enough except that the api frontend
can also use this and it can't use the full power of Trust Me Buddy™
that qbo maps require

this causes unnecessary ioctl syncs, which annihilates perf in games
that constantly check query results

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31823>

src/gallium/drivers/zink/zink_query.c

@@ -662,7 +662,7 @@ get_query_result(struct pipe_context *pctx,
    unsigned flags = PIPE_MAP_READ;
 
    if (!wait)
-      flags |= PIPE_MAP_DONTBLOCK;
+      flags |= ZINK_MAP_QBO;
    if (query->base.flushed)
       /* this is not a context-safe operation; ensure map doesn't use slab alloc */
       flags |= PIPE_MAP_THREAD_SAFE;

src/gallium/drivers/zink/zink_resource.c

@@ -2362,6 +2362,8 @@ zink_buffer_map(struct pipe_context *pctx,
          /* At this point, the buffer is always idle (we checked it above). */
          usage |= PIPE_MAP_UNSYNCHRONIZED;
       }
+   } else if (usage & ZINK_MAP_QBO) {
+      usage |= PIPE_MAP_UNSYNCHRONIZED;
    } else if (usage & PIPE_MAP_DONTBLOCK) {
       /* sparse/device-local will always need to wait since it has to copy */
       if (!res->obj->host_visible)

src/gallium/drivers/zink/zink_resource.h

@@ -27,6 +27,7 @@
 #include "zink_types.h"
 
 #define ZINK_MAP_TEMPORARY (PIPE_MAP_DRV_PRV << 0)
+#define ZINK_MAP_QBO (PIPE_MAP_DRV_PRV << 1)
 #define ZINK_BIND_DESCRIPTOR (1u << 27)
 #define ZINK_BIND_MUTABLE (1u << 28)
 #define ZINK_BIND_DMABUF (1u << 29)