ACPI: CPPC: Fix remaining for_each_possible_cpu() to use online CPUs

ACPI: CPPC: Fix remaining for_each_possible_cpu() to use online CPUs

per_cpu(cpc_desc_ptr, cpu) object is initialized for only the online
CPUs via acpi_soft_cpu_online() --> __acpi_processor_start() -->
acpi_cppc_processor_probe().

However, send_pcc_cmd() and acpi_get_psd_map() still iterate over all
possible CPUs. In acpi_get_psd_map(), encountering an offline CPU
returns -EFAULT, causing cppc_cpufreq initialization to fail.

This breaks systems booted with "nosmt" or "nosmt=force".

Fix by using for_each_online_cpu() in both functions.

Fixes: 80b8286aeec0 ("ACPI / CPPC: support for batching CPPC requests")
Signed-off-by: Sean V Kelley <skelley@nvidia.com>
Link: https://patch.msgid.link/20260211212254.30190-1-skelley@nvidia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>