[mlir][amdgpu] Lower make_gather_dma_descriptor. (#172083)
* Makes `MakeDescriptorOp` a template for `make_dma_descriptor` and
`make_gather_dma_descriptor`.
* Makes verification and folder for `make_dma_descriptor` a template.
* Adds custom verification and folder for `make_dma_gather_descriptor`
based on tempalte.
* Adds `make_gather_dma_descriptor` op.
* Lowers `make_gather_dma_descriptor` to ROCDL.
