Remove unused CUDASolver.h from SparseCUDABlas (#70281)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/70281
Reviewed By: ngimel
Differential Revision: D33272704
Pulled By: malfet
fbshipit-source-id: a33a7f9cd1513115a0b9ab75530e85e9913e8dd3
