tz_log : use file->private_data to get tz_id for debugfs

In msm-4.19, since we are using debugfs there is no struct
as seq_file. seq_file is introduced msm-5.4 onwards where
procfs is used.

Change-Id: I1e4571431f3847b115844e8eae41d6b559e40ef9
Signed-off-by: Sonal Aggarwal <quic_sonaagga@quicinc.com>