UPSTREAM: PM / wakeup: Drop wakeup_source_drop()

After commit d856f39ac1cc ("PM / wakeup: Rework wakeup source timer
cancellation") wakeup_source_drop() is a trivial wrapper around
__pm_relax() and it has no users except for wakeup_source_destroy()
and wakeup_source_trash() which also has no users, so drop it along
with the latter and make wakeup_source_destroy() call __pm_relax()
directly.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
(cherry picked from commit 623217a0cc45a6c179303b3bbfdc594806a464cc)
Bug: 129087298
Signed-off-by: Tri Vo <trong@google.com>
Change-Id: I419150dcdbfce0689d6d287f6440bcd6c9ad1243