projects/p2b: Make generated vdl go code say "vanadium vdl tool".
projects/p2b: Make generated vdl go code say "vanadium vdl tool".

Change-Id: I4941eee1ab63a6f6ac77f4c4b524a4464f5be375

vanadium/pipe2browser,vanadium/pipe2browser,vanadium/pipe2browser,vanadium/pipe2browser