DEVELOPERS: Remove Niranjan Reddy from cgroupfs-mount

He can re-add with a new email if he wants, but his
current Rockwell email will bounce.

Signed-off-by: Matt Weber <matt@thewebers.ws>
Acked-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>