cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode

Users may disable HWP in firmware, in which case intel_pstate wouldn't load
unless the CPU model is explicitly supported.

Add ICELAKE_X to the list of CPUs that can register intel_pstate while not
advertising the HWP capability. Without this change, an ICELAKE_X in no-HWP
mode could only use the acpi_cpufreq frequency scaling driver.

See also commit d8de7a44 ("cpufreq: intel_pstate: Add Skylake servers
support").
Signed-off-by: NGiovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/cpufreq/intel_pstate.c

@@ -2272,6 +2272,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
 	X86_MATCH(ATOM_GOLDMONT,	core_funcs),
 	X86_MATCH(ATOM_GOLDMONT_PLUS,	core_funcs),
 	X86_MATCH(SKYLAKE_X,		core_funcs),
+	X86_MATCH(ICELAKE_X,		core_funcs),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);