soc: qcom: Add support to dump initial 100 sec bootup logs

Add support to dump initial 100 sec dmesg buffer into a
buffer available in minidump and fulldump.

Make logs copying from log_buf at 100 second interval
configurable. This is required to avoid memory sensitive
target from using this feature.

Change-Id: I50ab4f4596b62e86a7e3896efa6a9a002b1f810b
Signed-off-by: Komal Bajaj <kbajaj@codeaurora.org>
Signed-off-by: Prateek Sood <prsood@codeaurora.org>