[FOSS_TLK] Remove secure_monitor folder

Since secure_monitor is an independent repo, removing it
from tlk.

Change-Id: Ib865d118de3bb4d9eb53e71b27b32a4273d62d73
Reviewed-on: http://git-master/r/758971
Reviewed-by: Automatic_Commit_Validation_User
Tested-by: Inamdar Sharif <isharif@nvidia.com>
Reviewed-by: Varun Wadekar <vwadekar@nvidia.com>
68 files changed