[PATCH -next] cpufreq: add stub for get_cpu_idle_time() to fix scsi/lpfc driver build

[Randy Dunlap <rdunlap@infradead.org>]

From: Randy Dunlap <rdunlap@infradead.org>

To fix a build error in drivers/scsi/lpfc/lpfc_sli.c when
CONFIG_CPU_FREQ is not set/enabled, add a stub function for
get_cpu_idle_time() in <linux/cpufreq.h>.

../drivers/scsi/lpfc/lpfc_sli.c: In function ‘lpfc_init_idle_stat_hb’:
../drivers/scsi/lpfc/lpfc_sli.c:7330:26: error: implicit declaration of function ‘get_cpu_idle_time’; did you mean ‘set_cpu_active’? [-Werror=implicit-function-declaration]
   idle_stat->prev_idle = get_cpu_idle_time(i, &wall, 1);

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linux-pm@vger.kernel.org
Cc: James Smart <james.smart@broadcom.com>
Cc: Dick Kennedy <dick.kennedy@broadcom.com>
Cc: linux-scsi@vger.kernel.org
---
 include/linux/cpufreq.h |    4 ++++
 1 file changed, 4 insertions(+)

--- linux-next-20200706.orig/include/linux/cpufreq.h
+++ linux-next-20200706/include/linux/cpufreq.h
@@ -237,6 +237,10 @@ static inline unsigned int cpufreq_get_h
 {
 	return 0;
 }
+static inline u64 get_cpu_idle_time(unsigned int cpu, u64 *wall, int io_busy)
+{
+	return 0;
+}
 static inline void disable_cpufreq(void) { }
 #endif