ftrace: Get rid of ftrace_profile_bits

It seems that function profiler's hash size is fixed at 1024.  Add and
use FTRACE_PROFILE_HASH_BITS instead and update hash size macro.

Link: http://lkml.kernel.org/r/1365551750-4504-1-git-send-email-namhyung@kernel.org



Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>