soc:qcom: add bootinfo support

soc:qcom: add bootinfo support

The interface would
    1. export /proc/bootinfo to user space, bugreport can use it
    2. annotate boot info to last_kmsg
port the following gerrits
    http://gerrit.mot.com/862769
    http://gerrit.mot.com/848543
    http://gerrit.mot.com/845197
    http://gerrit.mot.com/792195
    http://gerrit.mot.com/782682

Change-Id: Icc0e48f833b119dad73a07cd564e24f169d1ac4d
Signed-off-by: zhaoxp3 <zhaoxp3@motorola.com>
Reviewed-on: https://gerrit.mot.com/1221136
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Submit-Approved: Jira Key