Add missing @Override when {@inheritDoc} exists

Otherwise, Checkstyle keeps nagging us with the following lint warning
whenever we touch the lines around them.

  Must include @java.lang.Override annotation when {@inheritDoc}
  Javadoc tag exists.

This CL also re-format the license header just to make Checkstyle
happy.

This is purely a no-op style change. There must be no behavior change.

Test: prebuilts/checkstyle/checkstyle.py -f frameworks/base/core/java/android/view/inputmethod/InputConnectionWrapper.java
Change-Id: I3d7cef4e6c1407a6c6d8ee75c0d8b75943d8701c