Improve fan curve

- Implement fan cooldown and heatup periods
- Add fan get/set commands
- Fix compilation with logging level lower than debug

src/common/include/common/command.h

@@ -16,6 +16,10 @@ enum Command {
     CMD_SPI = 5,
     // Reset EC
     CMD_RESET = 6,
+    // Get fan speeds
+    CMD_FAN_GET = 7,
+    // Set fan speeds
+    CMD_FAN_SET = 8,
     //TODO
 };