ACPI / processor: return specific error instead of -1

Since invalid_logical_cpuid() can check error values, so
return specific error instead of -1 for acpi_map_cpuid().

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>