Clean up anomalies identified in code review comments

Lanai code review PR - https://github.com/openjdk/jdk/pull/2403 has identified few minor cleanups-

1) Remove only white space added to src/java.desktop/share/native/libawt/java2d/SurfaceData.c
2) src/java.desktop/macosx/classes/sun/java2d/metal/MTLGraphicsConfig.java - update copyright header to have 2019, 2021
3) Remove empty spacing added in files -
     - src/java.desktop/macosx/classes/sun/lwawt/macosx/CPlatformView.java
    - src/java.desktop/macosx/classes/sun/lwawt/macosx/CWarningWindow.java
4) Correct end of interface description comment in src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/EncoderManager.h
5) Typo in src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/EncoderManager.m - "generateion" should be "generation"
6) src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLGraphicsConfig.m -- line 83 - should be jboolean : This code is mixing types; it should be jboolean metalSupported
7) minor corrections in - src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLPaints.h
8) src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLSurfaceDataBase.h -- replace reference to openGL with Metal in comment
9 ) src/java.desktop/macosx/native/libawt_lwawt/java2d/metal/MTLTextRenderer.m -- replace reference to openGL drivers