BACKPORT: Documentation: tee subsystem and op-tee driver

Change-Id: Ic6c0af1b40e62132474ef8da2c7ddf226764ea56
Acked-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
(cherry picked from commit 6a6e77006fcdba89708214556c6d560323e850fc)
Signed-off-by: Victor Chong <victor.chong@linaro.org>
3 files changed