[BE] Remove `__iniline__` from `__global__` (#121246)
in layer_norm_kernel.cu since the qualifier seems to be ignored according to:
```
[18/263] Building CUDA object
caffe2/CMakeFiles/torch_cuda.dir/__/aten/src/ATen/native/cuda/layer_norm_kernel.cu.o
/home/mkozuki/ghq/github.com/crcrpar/torch-3/aten/src/ATen/native/cuda/layer_norm_kernel.cu(300):
warning #20050-D: inline qualifier ignored for "__global__" function
Remark: The warnings can be suppressed with "-diag-suppress
<warning-number>"
/home/mkozuki/ghq/github.com/crcrpar/torch-3/aten/src/ATen/native/cuda/layer_norm_kernel.cu(300):
warning #20050-D: inline qualifier ignored for "__global__" function
Remark: The warnings can be suppressed with "-diag-suppress
<warning-number>"
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121246
Approved by: https://github.com/eqy, https://github.com/malfet
