Revision 556311

devel/vulkan-*: update to 1.2.154

Changes:	https://github.com/KhronosGroup/Vulkan-Headers/compare/sdk-1.2.135.0...sdk-1.2.154.0
Changes:	https://github.com/KhronosGroup/Vulkan-Loader/compare/sdk-1.2.135.0...sdk-1.2.154.1
Changes:	https://github.com/KhronosGroup/Vulkan-Tools/compare/sdk-1.2.135.0...sdk-1.2.154.0
Changes:	https://github.com/KhronosGroup/Vulkan-ValidationLayers/compare/sdk-1.2.135.0...sdk-1.2.154.0
Changes:	https://github.com/KhronosGroup/SPIRV-Tools/compare/v2020.2...v2020.4
PR:		251345
Approved by:	Greg V <greg@unrelenting.technology> (maintainer, earlier version)
Submitted by:	Austin Shafer <ashafer@badland.io> (spirv-tools, vulkan-validation-layers)