cpufreq: intel_pstate: Avoid using CPPC when ACPI CPC is not valid

If ACPI CPC is not valid, dereference cpc_desc in cppc_get_perf() causes
a NULL pointer dereference. So avoid using CPPC for that scenario.

Fixes: 46573fd ("cpufreq: intel_pstate: hybrid: Rework HWP calibration")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>

drivers/cpufreq/intel_pstate.c

@@ -3369,7 +3369,7 @@ static int __init intel_pstate_init(void)
 			if (!default_driver)
 				default_driver = &intel_pstate;
 
-			if (boot_cpu_has(X86_FEATURE_HYBRID_CPU))
+			if (boot_cpu_has(X86_FEATURE_HYBRID_CPU) && acpi_cpc_valid())
 				intel_pstate_cppc_set_cpu_scaling();
 
 			goto hwp_cpu_matched;