Clarify license terms for Romain Guy's artwork.

As discussed with Romain Guy in the email thread, the Apache 2.0
license applies to the affected .jpg files now and retroactively from
the time of import.

The image was altered using the exiftool:

exiftool -WebStatement=http://www.apache.org/licenses/LICENSE-2.0 \
    -UsageTerms='Apache License Version 2.0'

Change-Id: I9bd4cc7f146240939ca09d14bf12ded790e37988
diff --git a/overlay/frameworks/base/core/res/res/drawable-hdpi/default_wallpaper.jpg b/overlay/frameworks/base/core/res/res/drawable-hdpi/default_wallpaper.jpg
index 811149b..99ce569 100644
--- a/overlay/frameworks/base/core/res/res/drawable-hdpi/default_wallpaper.jpg
+++ b/overlay/frameworks/base/core/res/res/drawable-hdpi/default_wallpaper.jpg
Binary files differ