Add flags to compile ck gemms under pytorch (pytorch#4878)

Summary:
X-link: facebookresearch/FBGEMM#1903

Pull Request resolved: pytorch#4878

Reviewed By: ionuthristodorescu

Differential Revision: D82511112

Pulled By: q10

fbshipit-source-id: 13f81cc7d19ff7202937e7c57d8bd898bf4c959e

Author: pragupta

fbgemm_gpu/experimental/gen_ai/src/quantize/ck_extensions/fp8_rowwise_grouped/fp8_rowwise_grouped_gemm.hip

@@ -5,7 +5,7 @@
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
  */
-
+#undef __HIP_NO_HALF_CONVERSIONS__
 #include <cmath>
 #include <cstdlib>
 #include <string>

fbgemm_gpu/experimental/gen_ai/src/quantize/ck_extensions/fp8_rowwise_grouped/kernels/fp8_rowwise_grouped_common.h

@@ -5,7 +5,7 @@
  * This source code is licensed under the BSD-style license found in the
  * LICENSE file in the root directory of this source tree.
  */
-
+#undef __HIP_NO_HALF_CONVERSIONS__
 #include <ATen/ATen.h>
 #ifdef USE_ROCM
 #include <c10/hip/HIPStream.h>