[AMD] Remove obsolete knobs.amd.lld_path (#7716)

No longer used after #7548

Author: ShawnZhong

python/triton/knobs.py

@@ -443,7 +443,6 @@ class amd_knobs(base_knobs):
     use_buffer_atomics: env_bool = env_bool("AMDGCN_USE_BUFFER_ATOMICS", True)
     dump_amdgcn: env_bool = env_bool("AMDGCN_ENABLE_DUMP")
     libhip_path: env_opt_str = env_opt_str("TRITON_LIBHIP_PATH")
-    lld_path: env_opt_str = env_opt_str("TRITON_HIP_LLD_PATH")
 
     # We use strs so that we can have a default value based on other runtime info
     use_block_pingpong: env_opt_bool = env_opt_bool("TRITON_HIP_USE_BLOCK_PINGPONG")