[cuBLAS] Fix default cuBLAS workspace size and parsing for multiple workspaces (#89027)
Follow-up of #86167 ; The number of pools was mistakenly ignored and the default workspace size appears to be too small to match selected cuBLAS kernels before the explicit allocation change.
CC @ptrblck @ngimel
Pull Request resolved: https://github.com/pytorch/pytorch/pull/89027
Approved by: https://github.com/ngimel