cpufreq: pcc: Fix the potentinal scheduling delays in target_index()

pcc_cpufreq_target():
cpufreq_freq_transition_begin();
spin_lock(&pcc_lock);
[critical section]
cpufreq_freq_transition_end();
spin_unlock(&pcc_lock);

Above code has a performance issue, consider that Task0 executes
'cpufreq_freq_transition_end()' to wake Task1 and preempted imediatedly
without releasing 'pcc_lock', then Task1 needs to wait for Task0 to
release 'pcc_lock'. In the worst case, this locking order can result in
Task1 wasting two scheduling rounds before it can enter the critical
section.

Signed-off-by: Liao Chang <[e-mail]>
Acked-by: Viresh Kumar <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/cpufreq/pcc-cpufreq.c

···
 	status = ioread16(&pcch_hdr->status);
 	iowrite16(0, &pcch_hdr->status);
 
-	cpufreq_freq_transition_end(policy, &freqs, status != CMD_COMPLETE);
 	spin_unlock(&pcc_lock);
+	cpufreq_freq_transition_end(policy, &freqs, status != CMD_COMPLETE);
 
 	if (status != CMD_COMPLETE) {
 		pr_debug("target: FAILED for cpu %d, with status: 0x%x\n",