cpufreq: intel_pstate: hybrid: Fix build with CONFIG_ACPI unset

One of the previous commits introducing hybrid processor support to
intel_pstate broke build with CONFIG_ACPI unset.

Fix that and while at it make empty stubs of two functions related
to ACPI CPPC static inline and fix a spelling mistake in the name of
one of them.

Fixes: eb3693f0

 ("cpufreq: intel_pstate: hybrid: CPU-specific scaling factor")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org> # build-tested