### What this PR does / why we need it?
This PR adapts bugfixes from `norm_quant_fusion_pass` to
`graphex_norm_quant_fusion_pass` for the `npugraph_ex` backend.
The main changes are:
- Replaced `torch.ops.npu.npu_add_rms_norm` with
`torch.ops._C_ascend.npu_add_rms_norm_bias`.
- For patterns without bias, `None` is passed as the bias argument.
- For patterns with bias, the separate `add` operation for bias is
removed and the bias is passed directly to `npu_add_rms_norm_bias`. This
improves fusion.
These changes ensure consistency and correctness for RMSNorm and
quantization fusion patterns when using `npugraph_ex`.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
- vLLM version: v0.15.0
- vLLM main:
9562912cea
Signed-off-by: huyuanquan1 <huyuanquan1@huawei.com>
Co-authored-by: huyuanquan1 <huyuanquan1@huawei.com>
87a0b7b7c7