procfs: Update order of Ngid in /proc/PID/status

Addition of Ngid breaks some third party applications, which
are dependent on a particular order of fields. This change
moves the field to the end, to fix this issue.

Change-Id: Ifdc781aca49dcb535d5fa5005b85dc87604560dc
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>