soc: qcom: bgdaemon: add interface to get TWM exit flag

Add an interface to find if the device bootup is after traditional
watch mode exit.

Change-Id: I174850bf09a8c91c2265c4675d4df735292d7fde
Signed-off-by: Ajit Kumar <kajit@codeaurora.org>
Signed-off-by: Ramesh Yadav Javadi <javadi@codeaurora.org>