Revert "trace: Add an option to show tgids in trace output"

This reverts commit 0438cf86 ("trace: Add an option to
show tgids in trace output").

Reverting this patch because array overflow can occur to
array saved_tgids[] when user sets the saved_cmdlines_size
from debugfs to more than size of saved_tgids[] that is 128.

Change-Id: I4ac838e19eec1870bea16dccaac648e34cb40ef1
[spathi@codeaurora.org: resolved trivial merge conflicts]
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>