cpufreq: Fix restore of policy min/max for hotplug

Commit fdfdc36e
("cpufreq: Save and restore user min/max freq for hotplug") only
partially achieved what it intended due to wrong placement of policy
restore code.

While policy->user_policy.min/max are restored correctly, new_policy
min/max have copied initial policy->min/max instead of
restored ones. cpufreq_set_policy() overwrites restored policy->min/max
after setting the frequency, resulting in a policy->min/max range that
potentially violates the one specified by policy->user_policy. The
error will persist until next time cpufreq_update_policy() is called.

Fix by moving policy min/max restore before copying current policy to
new_policy.

Change-Id: Ib97500d26fcd98dc23d26456c699abfeaa9a9c07
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>