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[Bugfix][TIR][VTA] Update host-side target, even without device func (a…
…pache#14982) This resolves an issue introduced by the combination of apache#14918 and apache#14945. The bug occurred for targets that do not require device-side codegen, but do require a `device_type` other than `kDLCPU`. It wasn't caught by CI, as the issue only occurred with the combination of both PRs. 1. apache#14918 updated `SplitHostDevice` to only modify the `"target"` attribute when a device-side function has been extracted. 2. For VTA, there is no device-side function, as everything is done through host-side API calls. 3. From (1) and (2), the VTA examples kept the target `T.target("ext_dev", host="llvm")` after the `SplitHostDevice` pass, instead of being updated to `T.target("llvm")`. 4. apache#14945 restricted CombineContextCall to only apply to host-side passes. 5. From (4) and (5), the `CombineContextCall` pass was no longer applied to the VTA context calls. This PR fixes `SplitHostDevice`, updating the target from `T.target("ext_dev", host="llvm")` to `T.target("llvm")`, even if no device sections have been extracted from the function.
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