intel_pstate: Improve initial busy calculation
intel_pstate: Improve initial busy calculation

This change makes the busy calculation using 64 bit math which prevents
overflow for large values of aperf/mperf.

Cc: 3.14+ <4fbacc2fa0ffdbb11bf1ad6925b886ebd08dd15f@vger.kernel.org> # 3.14+
Signed-off-by: Doug Smythies <cffe526240252daa897043091c626836b786f73e@telus.net>
Signed-off-by: Dirk Brandewie <90b1bc8a6ba9849b6d077cb338e79c4550ccbc5f@intel.com>
Signed-off-by: Rafael J. Wysocki <27ffc44a8ec6a212fba98cfc3246c6ce8ab131e0@intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs