ACPI: PCC: Release resources on address space setup failure path

The allocated memory for the pcc_data struct doesn't get freed under an
error path in pcc_mbox_request_channel() or acpi_os_ioremap(). Also, the
PCC mailbox channel doesn't get freed under an error path in
acpi_os_ioremap().

Fixes: 77e2a047

 ("ACPI: PCC: Implement OperationRegion handler for the PCC Type 3 subtype")
Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>