Revert "Switch to vk_icdInitializeOpenInNamespaceCallback"

This reverts commit 4b18053d54987324b93870c34d275526035cfc44.

Reason for revert: Fails Fuchsia CQ because some prebuilts have not yet adopted the new Vulkan Loader. Will restore ASAP.

Change-Id: I7fcf5a4c765a8fb6bec262fabe7d08759abf34b2
1 file changed