util: Fix gcn-gpu docker download to v21-2

Change-Id: Ibb64d080dc72c7208c97a5272d443a17122ab60b
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/54468
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/util/dockerfiles/gcn-gpu/Dockerfile b/util/dockerfiles/gcn-gpu/Dockerfile
index dee02b0..4102d68 100644
--- a/util/dockerfiles/gcn-gpu/Dockerfile
+++ b/util/dockerfiles/gcn-gpu/Dockerfile
@@ -70,7 +70,7 @@
 
 WORKDIR /ROCclr
 # The patch allows us to avoid building blit kernels on-the-fly in gem5
-RUN wget -q -O - dist.gem5.org/dist/develop/rocm_patches/ROCclr.patch | git apply -v
+RUN wget -q -O - dist.gem5.org/dist/v21-2/rocm_patches/ROCclr.patch | git apply -v
 
 WORKDIR /ROCclr/build
 RUN cmake -DOPENCL_DIR="/ROCm-OpenCL-Runtime" \