[mlir][nvgpu] Improve `tensormap.descriptor` Type Verifier (#77904)

This PR improves the verifier for the `nvgpu.tensormap.descriptor` type.
The descriptor contains information for TMA, and the compile-time check
ensures its restrictions, such as the last memory dimension being
128-byte. This prevents runtime crashes.

See cuda driver for more explanation:

https://docs.nvidia.com/cuda/cuda-driver-api/group__CUDA__TENSOR__MEMORY.html#group__CUDA__TENSOR__MEMORY_1ga7c7d2aaac9e49294304e755e6f341d7