cpufreq: arm_big_little: fix module license spec

Having no license specification in a module taints the kernel during load
with:

	arm_big_little: module license 'unspecified' taints kernel.

and also the linker doesn't allow it to make use of GPL-exported symbols
which in this case also results in errors like:

	arm_big_little: Unknown symbol cpufreq_register_driver (err 0)

. The header of the driver specifies a GPL v2 license, so note that
accordingly. While at it also add a description and an author and fix
the license in a companion file to explicit v2.
Reported-by: Andreas Schwab <schwab@suse.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/arm_big_little.c

@@ -24,6 +24,7 @@
 #include <linux/cpufreq.h>
 #include <linux/cpumask.h>
 #include <linux/export.h>
+#include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of_platform.h>
 #include <linux/pm_opp.h>
@@ -593,3 +594,7 @@ void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
 	arm_bL_ops = NULL;
 }
 EXPORT_SYMBOL_GPL(bL_cpufreq_unregister);
+
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver");
+MODULE_LICENSE("GPL v2");

drivers/cpufreq/arm_big_little_dt.c

@@ -114,4 +114,4 @@ module_platform_driver(generic_bL_platdrv);
 
 MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
 MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");