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

See also the following past commits:

commit d8de7a44 ("cpufreq: intel_pstate: Add Skylake servers support")
commit 706c5328 ("cpufreq: intel_pstate: Add Cometlake support in
no-HWP mode")
commit fbdc21e9 ("cpufreq: intel_pstate: Add Icelake servers support in
no-HWP mode")
commit 71bb5c82 ("cpufreq: intel_pstate: Add Tigerlake support in
no-HWP mode")
Signed-off-by: Giovanni Gherdovich <ggherdovich@suse.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>