完善 MACA 后端适配：CMake 校验、架构传递、contrib 入口与 Relax 外部库入口

[Zhao-Shi-jie]

11fab38 [FIX][MACA] Avoid configure-time tvm-ffi mutation

将 MACA CMake 配置阶段对 3rdparty/tvm-ffi 和 DLPack 的自动写入改为只读校验。启用 USE_MACA 时会检查 kDLMACA/kDLMACAHost 是否已经存在，缺失时给出明确错误，避免 configure 阶段污染 submodule，也让第三方源码 patch 的来源更清晰。

41fb496 [FIX][MACA] Propagate arch and gate WMMA rules

贯通 MACA target mcpu 到 mxcc 编译命令，确保生成 -offload-arch=xcoreXXXX，并修正 xcore compute version 解析。同时 MetaSchedule 不再对所有 MACA target 无条件使用 maca-wmma，而是按显式能力列表选择规则；当前仅 xcore1000 走 WMMA，xcore700/xcore800 走普通 MACA schedule。

a1df82a [FIX][MACA] Add mxcc contrib wrapper

新增 tvm.contrib.mxcc 兼容入口，复用 tvm.support.mxcc 的实现，解决 from tvm.contrib import mxcc 导入失败的问题。这样下游代码和 contrib 风格测试可以继续使用统一的 contrib 路径。

b11271b [FIX][MACA] Add Relax contrib entrypoint

新增 Relax MACA 外部库 offload 的稳定入口 tvm.relax.backend.contrib.maca，提供 supported_libraries()、is_available() 和 partition_for_maca()。在 mcBLAS/mcDNN/mcFFT codegen 与 runtime 尚未接入前，接口会明确返回不可用或抛出 NotImplementedError，避免模块缺失或隐式失败。

[gemini-code-assist]

Code Review

This pull request refactors and improves MACA support in TVM. Key changes include replacing CMake-time submodule mutation with explicit source-level checks, adding MACA architecture normalization and compute version parsing, restricting WMMA support in meta-schedule space generation to MACA targets that explicitly support it (e.g., xcore1000), and adding placeholder Relax entry points for MACA external libraries. One piece of feedback suggests removing a redundant function redefinition in python/tvm/contrib/mxcc.py to simplify the code and preserve the original docstring.

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[gemini-code-assist]

在 python/tvm/contrib/mxcc.py 中重新定义 get_maca_arch 是多余的，因为 from tvm.support.mxcc import * 已经导入并导出了具有完全相同签名和行为的 get_maca_arch。此外，tvm.support.mxcc 中的原始函数包含更详细的 docstring，而这里的重定义会覆盖并丢失这些详细的文档信息。

建议移除多余的 _mxcc 导入和 get_maca_arch 函数重定义，直接使用通配符导入即可简化该文件。

Suggested change

	from tvm.support import mxcc as _mxcc
	from tvm.support.mxcc import * # pylint: disable=wildcard-import,unused-wildcard-import
	def get_maca_arch(maca_path="/opt/maca"):
	"""Return the MACA architecture using the support module callback."""
	return _mxcc.get_maca_arch(maca_path)
	from tvm.support.mxcc import * # pylint: disable=wildcard-import,unused-wildcard-import

[Five-HZ]

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