drivers: qcom: pil: Use update_marker for modem book kpi

Use update_marker instead of place_marker to avoid OOM
issue if boot kpi file keeps growing.
Add update_marker() declaration in boot_stats header file.

Change-Id: I9b842c10670b2adb918e246174fdac45fb53de40
Signed-off-by: Khaja Hussain Shaik Khaji <quic_kshaikkh@quicinc.com>