'us' can overflow and can potentially cause unexpected wakeup.
Change it to uint64_t.
Change-Id: I943cbc9d62268ca073e388c287e3b180c0eaa8e3
Signed-off-by: Girish S Ghongdemath <girishsg@codeaurora.org>
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>