ACPI: CPPC: Fix some kernel-doc comments

Add the description of @pcc_ss_id in pcc_data_alloc().
Add the description of @cpu_num in cppc_get_transition_latency().

clear the below warnings:
drivers/acpi/cppc_acpi.c:607: warning: Function parameter or member 'pcc_ss_id' not described in 'pcc_data_alloc'
drivers/acpi/cppc_acpi.c:1616: warning: Function parameter or member 'cpu_num' not described in 'cppc_get_transition_latency'

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3983
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
[ rjw: Dropped redundant empty code lines, minor edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Author: Yang Li

drivers/acpi/cppc_acpi.c

@@ -595,6 +595,7 @@ bool __weak cpc_supported_by_cpu(void)
 
 /**
  * pcc_data_alloc() - Allocate the pcc_data memory for pcc subspace
+ * @pcc_ss_id: PCC Subspace index as in the PCC client ACPI package.
  *
  * Check and allocate the cppc_pcc_data memory.
  * In some processor configurations it is possible that same subspace
@@ -1536,6 +1537,7 @@ EXPORT_SYMBOL_GPL(cppc_set_perf);
 
 /**
  * cppc_get_transition_latency - returns frequency transition latency in ns
+ * @cpu_num: CPU number for per_cpu().
  *
  * ACPI CPPC does not explicitly specify how a platform can specify the
  * transition latency for performance change requests. The closest we have