Revert D24379422: [py][vulkan] Add is_vulkan to py api, add vulkan to device type parsing
Test Plan: revert-hammer
Differential Revision:
D24379422 (https://github.com/pytorch/pytorch/commit/e8fbe54cf50c7ae471e07d576bae1c5b3a154703)
Original commit changeset: afab89bb9e17
fbshipit-source-id: 743c77e453239f10c155c67490cba5a42ab42f58
