cpufreq: loongson3: Use raw_smp_processor_id() in do_service_request()

Use raw_smp_processor_id() instead of plain smp_processor_id() in
do_service_request(), otherwise we may get some errors with the driver
enabled:

 BUG: using smp_processor_id() in preemptible [00000000] code: (udev-worker)/208
 caller is loongson3_cpufreq_probe+0x5c/0x250 [loongson3_cpufreq]
Reported-by: Xi Ruoyao <xry111@xry111.site>
Tested-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/loongson3_cpufreq.c

@@ -176,7 +176,7 @@ static DEFINE_PER_CPU(struct loongson3_freq_data *, freq_data);
 static inline int do_service_request(u32 id, u32 info, u32 cmd, u32 val, u32 extra)
 {
 	int retries;
-	unsigned int cpu = smp_processor_id();
+	unsigned int cpu = raw_smp_processor_id();
 	unsigned int package = cpu_data[cpu].package;
 	union smc_message msg, last;