Revert D28248766: Update internal code for torch.linalg.solve
Test Plan: revert-hammer
Differential Revision:
D28248766 (https://github.com/pytorch/pytorch/commit/5f2925074bf6b608064bb80a757bc617b74b4aa3)
Original commit changeset: 300366605653
fbshipit-source-id: 316b97791e57f9017d4bf87898aea8dc869cba79
