Revert "vulkan: Updated LICENSE.txt with all known license information"
Revert "vulkan: Updated LICENSE.txt with all known license information"

This reverts commit 3d2dc08ed28b159f1d86476add4719b3ec975b1b.

Just adding attributiones here does not match our SDK
and loader redistributable plans. Will add attributions to
specific areas rather than a global attribution file.

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools