[hal] Add CAN device type for servo controllers (#7556)

hal/src/main/java/edu/wpi/first/hal/CANAPITypes.java

@@ -47,6 +47,8 @@ public final class CANAPITypes {
     kMiscellaneous(10),
     /** IO breakout. */
     kIOBreakout(11),
+    /** Servo Controller. */
+    kServoController(12),
     /** Firmware update. */
     kFirmwareUpdate(31);
 

hal/src/main/native/include/hal/CANAPITypes.h

@@ -44,6 +44,8 @@ HAL_ENUM(HAL_CANDeviceType) {
   HAL_CAN_Dev_kMiscellaneous = 10,
   /// IO breakout.
   HAL_CAN_Dev_kIOBreakout = 11,
+  // Servo controller.
+  HAL_CAN_Dev_kServoController = 12,
   /// Firmware update.
   HAL_CAN_Dev_kFirmwareUpdate = 31
 };