[HIPIFY][tests] Exclude one more test if CUDA == 7.0, which is of CUDA 7.5

tests/hipify-clang/lit.cfg

@@ -17,6 +17,7 @@ config.excludes = ['cmdparser.hpp']
 
 if config.cuda_version_major == 7 and config.cuda_version_minor == 0:
     config.excludes.append('headers_test_09.cu')
+    config.excludes.append('cudnn_convolution_forward.cu')
 if config.cuda_version_major < 8:
     config.excludes.append('cuSPARSE_02.cu')
 if config.cuda_version_major < 9: