add cpu frequency driver

app/cpu/drivers/drivers.go

@@ -0,0 +1,31 @@
+package drivers
+
+type TemperatureSensor struct {
+	path  string
+	Name  string
+	TempC float64
+}
+
+type TemperatureDriver interface {
+	ReadTemperatureSensors() ([]TemperatureSensor, error)
+}
+
+type PowerSensor struct {
+	path  string
+	Name  string
+	Watts float64
+}
+
+type PowerDriver interface {
+	ReadPowerSensors() ([]PowerSensor, error)
+}
+
+type ClockSensor struct {
+	path         string
+	Name         int
+	FrequencyGHz float64
+}
+
+type ClockDriver interface {
+	ReadClockSensors() ([]ClockSensor, error)
+}