mpsutil: Clean up libutil deps
mpsutil doesn't use libutil, so doesn't need to include libutil.h. See
commit 76103694a051335bec1da318f9c6e3a676dc0145.
No functional change intended.
MFC after: 1 week
(cherry picked from commit d56ce5915c41517ccc7de2510daec200e100ef68)