cpufreq: intel_pstate: hide unused intel_pstate_cpu_oob_ids[]

The reference to this variable is hidden in an #ifdef:

drivers/cpufreq/intel_pstate.c:2440:32: error: 'intel_pstate_cpu_oob_ids' defined but not used [-Werror=unused-const-variable=]

Use the same check around the definition.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -2397,6 +2397,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
 
+#ifdef CONFIG_ACPI
 static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
 	X86_MATCH(BROADWELL_D,		core_funcs),
 	X86_MATCH(BROADWELL_X,		core_funcs),
@@ -2405,6 +2406,7 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
 	X86_MATCH(SAPPHIRERAPIDS_X,	core_funcs),
 	{}
 };
+#endif
 
 static const struct x86_cpu_id intel_pstate_cpu_ee_disable_ids[] = {
 	X86_MATCH(KABYLAKE,		core_funcs),