ftrace: Remove NR_TO_INIT macro

This macro isn't used from commit cb7be3b2 ("ftrace: remove
daemon"). So no needs to keep it.

Link: http://lkml.kernel.org/r/1579586063-44984-1-git-send-email-alex.shi@linux.alibaba.com



Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>