tzlog: update struct to get normal and fatal diag logs

Add support and update struct to get tz diag logs
in two different chunks i.e. entire logs or fatal
logs.

Test: 1. Basic Bootup with all subsystems out of
         reset on secboot device
      2. SSR on secboot device (Modem, ADSP, CDSP)
      3. All flags set in APDP except JTAG
      4. All flags set to 0 in APDP
      5. Only offline dump flag set in APDP
      6. Only NS dump flag set in APDP
      7. Only Enable Logs flag set in APDP

Change-Id: Idea5ebdf6c558b4a2e26031334f47eb7914a0615
Signed-off-by: Vaibhav Agrawal <vagrawa@codeaurora.org>