scripts: Move spirv_tools_commit_id.h to gen dir

Remove spirv_tools_commit_id.h from CMake and add to generated dir.

Change-Id: I7a3cf97a8a973661e1a713a5c22938ec13bfbe95
diff --git a/layers/shader_validation.h b/layers/shader_validation.h
index 6c399a4..8bf1b44 100644
--- a/layers/shader_validation.h
+++ b/layers/shader_validation.h
@@ -23,7 +23,7 @@
 #include <unordered_map>
 
 #include <SPIRV/spirv.hpp>
-#include <spirv_tools_commit_id.h>
+#include <generated/spirv_tools_commit_id.h>
 #include "spirv-tools/optimizer.hpp"
 
 // A forward iterator over spirv instructions. Provides easy access to len, opcode, and content words