[Vulkan] Code Quality: Remove duplicate code for hardshrink and leaky_relu functions (#64405)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64405
Code quality improvement: removed duplicate code for hardshrink and leaky_relu functions.
ghstack-source-id: 137319378
Test Plan:
```buck build -c ndk.custom_libcxx=false -c pt.enable_qpl=0 //xplat/caffe2:pt_vulkan_api_test_binAndroid\#android-arm64 --show-output
adb push buck-out/gen/xplat/caffe2/pt_vulkan_api_test_binAndroid\#android-arm64 /data/local/tmp/vulkan_api_test
adb shell "/data/local/tmp/vulkan_api_test"```
Reviewed By: SS-JIA
Differential Revision: D30690251
fbshipit-source-id: 5729d1f32946e42f41df77756a8313f297dd822f
