perf/arm-cc*: Fix MODULE_LICENSE() tags

The CCI/CCN drivers are licensed under GPLv2, but the MODULE_LICENSE()
tags are using the bare "GPL" string implying GPLv2 or later. Fix them
to match their actual file license.
Acked-by: Pawel Moll <pawel.moll@arm.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>

drivers/perf/arm-cci.c

@@ -1709,5 +1709,5 @@ static struct platform_driver cci_pmu_driver = {
 };
 
 builtin_platform_driver(cci_pmu_driver);
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("ARM CCI PMU support");

drivers/perf/arm-ccn.c

@@ -1594,4 +1594,4 @@ module_init(arm_ccn_init);
 module_exit(arm_ccn_exit);
 
 MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
-MODULE_LICENSE("GPL");
+MODULE_LICENSE("GPL v2");