[llvm] MLIR BUILD.bazel: fold `BasicPtxBuilderInterface` into `NVVMDialect` (PR #111172)

[Benoit Jacob via llvm-commits]

bjacob wrote:

(To be clear, this fixes Bazel build breakage already present upstream, not just downstream.  Here is a downstream CI run that's fixed by this PR: https://github.com/iree-org/iree/actions/runs/11182717531/job/31089636040?pr=18696)

https://github.com/llvm/llvm-project/pull/111172