Skipping test on branch with no MIOpen immediate mode support (pytorch#1175)

Support for MIOpen immediate mode is not enabled in release branches

required for the test_Conv2d_naive_groups test to pass https://ontrack-internal.amd.com/browse/SWDEV-355273

cherry-pick from ROCm@ad6db00

Author: jataylo

test/test_nn.py

@@ -16266,6 +16266,8 @@ def test_multihead_attention_dtype(self, device, dtype):
         self.assertEqual(q.size(), out[0].size())
         self.assertEqual(dtype, out[0].dtype)
 
+    # Skip the test for ROCm as per https://ontrack-internal.amd.com/browse/SWDEV-355273
+    @skipIfRocm
     @dtypesIfCUDA(*get_all_fp_dtypes(include_bfloat16=AMPERE_OR_ROCM))
     @dtypes(torch.float)
     def test_Conv2d_naive_groups(self, device, dtype):