[TOSA] Fix rsub; add clamp.Tensor, avg_pool1d, max_pool1d, prims.coll…

…apse (#3855)

- Fix aten.rsub.Scalar legalization with appropriate type casting
- Add legalization for aten.clamp.Tensor
- Resolve some unexpected test failures from PyTorch update by adding
legalization for the following ops:
  + aten.avg_pool1d
  + aten.max_pool1d
  + torch.prims.collapse
- Update xfail_sets with new e2e results
- Add new LIT tests to basic.mlir


Change-Id: I9762c7d36ca0b0f75ca68d0c71d7f5d5309a96ad

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Signed-off-by: Justin Ngo <justin.ngo@arm.com>