mesa: Clamp some depth values in glClearBufferfi

OpenGL 3.0 spec, section 4.2.3 "Clearing the Buffers":

   depth and stencil are the values to clear the depth and stencil
   buffers to, respectively. Clamping and type conversion for
   fixed-point depth buffers are performed in the same fashion as for
   ClearDepth.

Enables iris to pass the clearbuffer-depth-stencil piglit test.

Cc: mesa-stable
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7410>
(cherry picked from commit 2e713313a29422b38435c91f8277c1893fcad095)
diff --git a/.pick_status.json b/.pick_status.json
index ad51376..2396e4e 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -1084,7 +1084,7 @@
         "description": "mesa: Clamp some depth values in glClearBufferfi",
         "nominated": true,
         "nomination_type": 0,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": null
     },