Fix analyze/lint errors

- Lint doesn't like a static import of something not available on
  the minimum API level.
- The method linked to in the Javadoc was incorrect (wrong signature).
  I couldn't really work out why it was there, so I got rid of it
  rather than updating.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=179222587

library/core/src/main/java/com/google/android/exoplayer2/audio/ChannelMappingAudioProcessor.java

@@ -51,8 +51,6 @@ public ChannelMappingAudioProcessor() {
   /**
    * Resets the channel mapping. After calling this method, call {@link #configure(int, int, int)}
    * to start using the new channel map.
-   *
-   * @see AudioSink#configure(String, int, int, int, int, int[], int, int)
    */
   public void setChannelMap(int[] outputChannels) {
     pendingOutputChannels = outputChannels;

library/core/src/main/java/com/google/android/exoplayer2/video/DummySurface.java

@@ -24,7 +24,6 @@
 import static android.opengl.EGL14.EGL_GREEN_SIZE;
 import static android.opengl.EGL14.EGL_HEIGHT;
 import static android.opengl.EGL14.EGL_NONE;
-import static android.opengl.EGL14.EGL_NO_SURFACE;
 import static android.opengl.EGL14.EGL_OPENGL_ES2_BIT;
 import static android.opengl.EGL14.EGL_RED_SIZE;
 import static android.opengl.EGL14.EGL_RENDERABLE_TYPE;
@@ -326,7 +325,7 @@ private void initInternal(@SecureMode int secureMode) {
 
       EGLSurface surface;
       if (secureMode == SECURE_MODE_SURFACELESS_CONTEXT) {
-        surface = EGL_NO_SURFACE;
+        surface = EGL14.EGL_NO_SURFACE;
       } else {
         int[] pbufferAttributes;
         if (secureMode == SECURE_MODE_PROTECTED_PBUFFER) {