[ROCm] Remove tilelang as a hard ROCm dependency

[mgehre-amd]

tilelang is used only for the DeepSeek V4 MHC kernels on AMD, with has_tilelang() guards everywhere so the unfused fallback path is taken when it is absent. Making it a hard install_requires causes two problems:

1. The TVM shared library bundled with tilelang aborts (SIGABRT) on some Strix Halo CI runners during pytest collection, killing the entire test process before any test runs.
2. It adds ~48 MiB of TVM machinery to every ROCm vLLM installation even on systems that never run DeepSeek V4.

Remove tilelang from requirements/rocm.txt, requirements/build/rocm.txt, and requirements/test/rocm.in.

Fixes CI failure

Fatal Python error: Aborted

Current thread 0x00007ccb7c5c9b80 (most recent call first):
  File "/usr/local/lib/python3.12/ctypes/__init__.py", line 379 in __init__
  File "/usr/local/lib/python3.12/site-packages/tilelang/__init__.py", line 141 in lazy_init
  File "/usr/local/lib/python3.12/site-packages/tilelang/3rdparty/tvm/python/tvm/libinfo.py", line 153 in load_lib_ctypes
  File "/usr/local/lib/python3.12/site-packages/tilelang/3rdparty/tvm/python/tvm/base.py", line 60 in <module>
  File "<frozen importlib._bootstrap>", line 488 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 999 in exec_module
  File "<frozen importlib._bootstrap>", line 935 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1331 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1360 in _find_and_load
  File "/usr/local/lib/python3.12/site-packages/tilelang/3rdparty/tvm/python/tvm/__init__.py", line 29 in <module>
  File "<frozen importlib._bootstrap>", line 488 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 999 in exec_module
  File "<frozen importlib._bootstrap>", line 935 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1331 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1360 in _find_and_load
  File "/usr/local/lib/python3.12/site-packages/tilelang/__init__.py", line 173 in <module>
  File "<frozen importlib._bootstrap>", line 488 in _call_with_frames_removed
  File "<frozen importlib._bootstrap_external>", line 999 in exec_module
  File "<frozen importlib._bootstrap>", line 935 in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1331 in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1360 in _find_and_load
  File "<frozen importlib._bootstrap>", line 1387 in _gcd_import
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90 in import_module
  File "/usr/local/lib/python3.12/site-packages/vllm/utils/import_utils.py", line 406 in _has_module