[FIX][CUDA] Select NVRTC architecture for output format

[jinhongyii]

NVRTC uses --gpu-architecture together with the requested output format. A real sm_* target produces a cubin, while a virtual compute_* target produces PTX.

The previous revision normalized every target to compute_*. With CUDA 13.2, compilation reported success, but nvrtcGetCUBINSize returned zero bytes; loading that image then failed with CUDA_ERROR_INVALID_IMAGE.

This change preserves architecture suffixes such as 100a and 100f, while selecting the prefix from the requested output:

• cubin: normalize to sm_*;
• PTX: normalize to compute_*.

Validation:

• python -m compileall -q python/tvm/support/nvcc.py
• CUDA 13.2 / B200 empty-kernel check: compute_100a yielded a zero-byte cubin and failed to load; sm_100a yielded a 4,888-byte cubin and loaded successfully.
• A TIRx NumSim/GPU float-atomic microtest failed with CUDA_ERROR_INVALID_IMAGE before this correction and passed through the default NVRTC path afterward.