UPSTREAM: PM / Domains: Drop unnecessary wakeup code from pm_genpd_prepare()

UPSTREAM: PM / Domains: Drop unnecessary wakeup code from pm_genpd_prepare()

As the PM core already have wakeup management during the system PM phase,
it seems reasonable that genpd and its users should be able to rely on
that. Therefore let's remove this from pm_genpd_prepare().

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 164a2159a2d6789bc7e3c4b126dde7f3ce865992)

Change-Id: I39f72aa82468327c01b4533d177f797bf2da59a6
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>