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/BluetoothGattCharacteristic.java b/core/java/android/bluetooth/BluetoothGattCharacteristic.java
index 4816804..2c12403 100644
--- a/core/java/android/bluetooth/BluetoothGattCharacteristic.java
+++ b/core/java/android/bluetooth/BluetoothGattCharacteristic.java
@@ -283,13 +283,12 @@
         }
     }
 
-    /**
-     * @hide
-     */
+    @Override
     public int describeContents() {
         return 0;
     }
 
+    @Override
     public void writeToParcel(Parcel out, int flags) {
         out.writeParcelable(new ParcelUuid(mUuid), 0);
         out.writeInt(mInstance);
@@ -300,8 +299,8 @@
         out.writeTypedList(mDescriptors);
     }
 
-    public static final Parcelable.Creator<BluetoothGattCharacteristic> CREATOR
-            = new Parcelable.Creator<BluetoothGattCharacteristic>() {
+    public static final Parcelable.Creator<BluetoothGattCharacteristic> CREATOR =
+            new Parcelable.Creator<BluetoothGattCharacteristic>() {
         public BluetoothGattCharacteristic createFromParcel(Parcel in) {
             return new BluetoothGattCharacteristic(in);
         }