cpufreq: amd-pstate: Document the units for freq variables in amd_cpudata

The min_limit_freq, max_limit_freq, min_freq, max_freq, nominal_freq
and the lowest_nominal_freq members of struct cpudata store the
frequency value in khz to be consistent with the cpufreq
core. Update the comment to document this.

Reviewed-by: Li Meng <li.meng@amd.com>
Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: gautshen

include/linux/amd-pstate.h

@@ -51,15 +51,15 @@ struct amd_aperf_mperf {
  * 		  priority.
  * @min_limit_perf: Cached value of the performance corresponding to policy->min
  * @max_limit_perf: Cached value of the performance corresponding to policy->max
- * @min_limit_freq: Cached value of policy->min
- * @max_limit_freq: Cached value of policy->max
- * @max_freq: the frequency that mapped to highest_perf
- * @min_freq: the frequency that mapped to lowest_perf
- * @nominal_freq: the frequency that mapped to nominal_perf
- * @lowest_nonlinear_freq: the frequency that mapped to lowest_nonlinear_perf
+ * @min_limit_freq: Cached value of policy->min (in khz)
+ * @max_limit_freq: Cached value of policy->max (in khz)
+ * @max_freq: the frequency (in khz) that mapped to highest_perf
+ * @min_freq: the frequency (in khz) that mapped to lowest_perf
+ * @nominal_freq: the frequency (in khz) that mapped to nominal_perf
+ * @lowest_nonlinear_freq: the frequency (in khz) that mapped to lowest_nonlinear_perf
  * @cur: Difference of Aperf/Mperf/tsc count between last and current sample
  * @prev: Last Aperf/Mperf/tsc count value read from register
- * @freq: current cpu frequency value
+ * @freq: current cpu frequency value (in khz)
  * @boost_supported: check whether the Processor or SBIOS supports boost mode
  * @hw_prefcore: check whether HW supports preferred core featue.
  * 		  Only when hw_prefcore and early prefcore param are true,