[gn build] Port d2df2e4

Author: llvmgnsyncbot

llvm/utils/gn/secondary/clang/lib/Driver/BUILD.gn

@@ -96,7 +96,6 @@ static_library("Driver") {
     "ToolChains/SPIRV.cpp",
     "ToolChains/Solaris.cpp",
     "ToolChains/TCE.cpp",
-    "ToolChains/UEFI.cpp",
     "ToolChains/VEToolchain.cpp",
     "ToolChains/WebAssembly.cpp",
     "ToolChains/XCore.cpp",