feat: add support for cpu freq governor metrics

Signed-off-by: Lukas Coppens <[email protected]>

Author: Lukas Coppens

collector/cpufreq_linux.go

@@ -18,10 +18,10 @@ package collector
 
 import (
 	"fmt"
-
 	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/procfs/sysfs"
+	"strings"
 )
 
 type cpuFreqCollector struct {