The pp_Vprintf (Verbose printf) macro, replaces PP_VPRINTF in the file
to ease generation of dumps.

All messages are build-time protected by "ifdef VERB_DUMP" anyways:
by removing the dependency on CONFIG_PPSI_RUNTIME_VERBOSITY it's
easier to enable the messages at build time because you just need
to set

   USER_CFLAGS="-DVERB_DUMP"

without the need to force RUNTIME_VERBOSITY as well.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>