camera2: Document minimum pixel array size restriction for ultra high resolution sensors.

Bug: 195987968

Test: atest ExtendedCameraCharacteristicsTest.java

Change-Id: I6b83b5a30b2768b45d2982e7978aaf6a9d892c40
Signed-off-by: Jayant Chowdhary <jchowdhary@google.com>
(cherry picked from commit 0cdba5761ff8a425f2d38296678d09d166a4cf25)
diff --git a/camera/ndk/include/camera/NdkCameraMetadataTags.h b/camera/ndk/include/camera/NdkCameraMetadataTags.h
index 52cd4b4..86781e5 100644
--- a/camera/ndk/include/camera/NdkCameraMetadataTags.h
+++ b/camera/ndk/include/camera/NdkCameraMetadataTags.h
@@ -9005,7 +9005,12 @@
      * <code>android.scaler.streamConfigurationMap</code> describes the streams supported in 'default'
      * mode.
      * The stream configurations supported in 'max resolution' mode are described by
-     * <code>android.scaler.streamConfigurationMapMaximumResolution</code>.</p>
+     * <code>android.scaler.streamConfigurationMapMaximumResolution</code>.
+     * The maximum resolution mode pixel array size of a camera device
+     * (<code>ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE</code>) with this capability,
+     * will be at least 24 megapixels.</p>
+     *
+     * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
      */
     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_ULTRA_HIGH_RESOLUTION_SENSOR
                                                                       = 16,