msm: vidc: Indicate secure sessions in debugfs

Print if instance is a secure session in `<debugfs root>/msm_vidc/\
core<id>/inst_<instance>/info` along with other useful info.

Change-Id: I77a3ef1a095e5225375aa4388044814f7e118383
Signed-off-by: Deva Ramasubramanian <dramasub@codeaurora.org>