cpufreq: powernow: Stop setting cpufreq_driver->attr field

The cpufreq core now handles this for basic attributes, including boost
frequencies, the driver can skip setting them.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>

drivers/cpufreq/powernow-k6.c

@@ -253,7 +253,6 @@ static struct cpufreq_driver powernow_k6_driver = {
 	.exit		= powernow_k6_cpu_exit,
 	.get		= powernow_k6_get,
 	.name		= "powernow-k6",
-	.attr		= cpufreq_generic_attr,
 };
 
 static const struct x86_cpu_id powernow_k6_ids[] = {

drivers/cpufreq/powernow-k7.c

@@ -667,7 +667,6 @@ static struct cpufreq_driver powernow_driver = {
 	.init		= powernow_cpu_init,
 	.exit		= powernow_cpu_exit,
 	.name		= "powernow-k7",
-	.attr		= cpufreq_generic_attr,
 };
 
 static int __init powernow_init(void)

drivers/cpufreq/powernow-k8.c

@@ -1143,7 +1143,6 @@ static struct cpufreq_driver cpufreq_amd64_driver = {
 	.exit		= powernowk8_cpu_exit,
 	.get		= powernowk8_get,
 	.name		= "powernow-k8",
-	.attr		= cpufreq_generic_attr,
 };
 
 static void __request_acpi_cpufreq(void)