push magma init into lazyInitCUDA (#18527)
Summary:
Tries to fix C++ API's usage of MAGMA-based functions.
Attempts to Fix https://github.com/pytorch/pytorch/issues/18074
Pull Request resolved: https://github.com/pytorch/pytorch/pull/18527
Differential Revision: D14691694
Pulled By: soumith
fbshipit-source-id: dd04e74418e486d73ea4a92193ddf79352ed71ba
