Fix checkstyle errors (2/2)

* Manual style corrections with IDE assistance
* Variable name refactors are done through IDE
* Corrected general style errors such as:
  - "final private var" -> "private final var"
  - "&&", "+", "||" should not be at the end of line
  - Non-static private variable should be like "mVar"
  - Private static variable should be like "sVar"
  - Code file should always end with newline
  - Inherited methods should be annotated with @Override
    and no @hide tags
  - Public methods should always have a JavaDoc entry
  - "int[] array" is preferred over "int array[]"
  - private methods should be accessed without "this."
    when there is no name collisions.
  - "boolean ? true : false" -> boolean
  - "boolean ? false : true" -> !boolean
  - "boolean == true" OR "boolean != false" -> boolean
  - "boolean != true" OR "boolean == false" -> !boolean

Bug: 63596319
Test: make checkbuild, no functional changes
Change-Id: Iabdc2be912a32dd63a53213d175cf1bfef268ccd
diff --git a/core/java/android/bluetooth/BluetoothInputDevice.java b/core/java/android/bluetooth/BluetoothInputDevice.java
index a9b2e56..a9a9010 100644
--- a/core/java/android/bluetooth/BluetoothInputDevice.java
+++ b/core/java/android/bluetooth/BluetoothInputDevice.java
@@ -224,7 +224,7 @@
     private BluetoothAdapter mAdapter;
     private IBluetoothInputDevice mService;
 
-    final private IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
+    private final IBluetoothStateChangeCallback mBluetoothStateChangeCallback =
             new IBluetoothStateChangeCallback.Stub() {
                 public void onBluetoothStateChange(boolean up) {
                     if (DBG) Log.d(TAG, "onBluetoothStateChange: up=" + up);
@@ -385,6 +385,7 @@
     /**
      * {@inheritDoc}
      */
+    @Override
     public List<BluetoothDevice> getConnectedDevices() {
         if (VDBG) log("getConnectedDevices()");
         if (mService != null && isEnabled()) {
@@ -402,6 +403,7 @@
     /**
      * {@inheritDoc}
      */
+    @Override
     public List<BluetoothDevice> getDevicesMatchingConnectionStates(int[] states) {
         if (VDBG) log("getDevicesMatchingStates()");
         if (mService != null && isEnabled()) {
@@ -419,6 +421,7 @@
     /**
      * {@inheritDoc}
      */
+    @Override
     public int getConnectionState(BluetoothDevice device) {
         if (VDBG) log("getState(" + device + ")");
         if (mService != null && isEnabled() && isValidDevice(device)) {
@@ -451,8 +454,8 @@
     public boolean setPriority(BluetoothDevice device, int priority) {
         if (DBG) log("setPriority(" + device + ", " + priority + ")");
         if (mService != null && isEnabled() && isValidDevice(device)) {
-            if (priority != BluetoothProfile.PRIORITY_OFF &&
-                    priority != BluetoothProfile.PRIORITY_ON) {
+            if (priority != BluetoothProfile.PRIORITY_OFF
+                    && priority != BluetoothProfile.PRIORITY_ON) {
                 return false;
             }
             try {