cpufreq: rename index as driver_data in cpufreq_frequency_table

The "index" field of struct cpufreq_frequency_table was never an
index and isn't used at all by the cpufreq core.  It only is useful
for cpufreq drivers for their internal purposes.

Many people nowadays blindly set it in ascending order with the
assumption that the core will use it, which is a mistake.

Rename it to "driver_data" as that's what its purpose is. All of its
users are updated accordingly.

[rjw: Changelog]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/blackfin-cpufreq.c b/drivers/cpufreq/blackfin-cpufreq.c
index 995511e80..9cdbbd2 100644
--- a/drivers/cpufreq/blackfin-cpufreq.c
+++ b/drivers/cpufreq/blackfin-cpufreq.c
@@ -20,23 +20,23 @@
 
 
 /* this is the table of CCLK frequencies, in Hz */
-/* .index is the entry in the auxiliary dpm_state_table[] */
+/* .driver_data is the entry in the auxiliary dpm_state_table[] */
 static struct cpufreq_frequency_table bfin_freq_table[] = {
 	{
 		.frequency = CPUFREQ_TABLE_END,
-		.index = 0,
+		.driver_data = 0,
 	},
 	{
 		.frequency = CPUFREQ_TABLE_END,
-		.index = 1,
+		.driver_data = 1,
 	},
 	{
 		.frequency = CPUFREQ_TABLE_END,
-		.index = 2,
+		.driver_data = 2,
 	},
 	{
 		.frequency = CPUFREQ_TABLE_END,
-		.index = 0,
+		.driver_data = 0,
 	},
 };