cpufrequtils aperf: Add cpuid support

Add cpuid() helpers blatantly stolen from the kernel sources and
use that for checking for aperf/mperf support instead of accessing
"/dev/cpu/%d/cpuid" which requires the module to be enabled on the
target system.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>