Add the c2c command to command-list.txt so perf help can list this
command.

Committer notes:

Before:

  # perf help | grep c2c
  #

After:

  # perf help | grep c2c
     c2c             Shared Data C2C/HITM Analyzer.
  #
Signed-off-by: Changbin Du <changbin.du@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20170313082845.23373-1-changbin.du@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>