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.

Usage terms updated with exiftool:

$ exiftool -UsageTerms='Apache License Version 2.0' \
    frameworks/base/tests/HwAccelerationTest/res/drawable-nodpi/very_large_photo.jpg
    1 image files updated
$ exiftool -URL -WebStatement -UsageTerms -Rights -Creator \
    frameworks/base/tests/HwAccelerationTest/res/drawable-nodpi/very_large_photo.jpg
Usage Terms                     : Apache License Version 2.0
Rights                          : Romain Guy
Creator                         : Romain Guy
$ exiftool -UsageTerms='Apache License Version 2.0' \
    frameworks/base/tests/UiBench/res/drawable-nodpi/frantic.jpg
Warning: [minor] Fixed incorrect list type for XMP-xmpRights:UsageTerms - frameworks/base/tests/UiBench/res/drawable-nodpi/frantic.jpg
    1 image files updated
$ exiftool -URL -WebStatement -UsageTerms -Rights -Creator \
    frameworks/base/tests/UiBench/res/drawable-nodpi/frantic.jpg
Usage Terms                     : Apache License Version 2.0
Rights                          : Romain Guy
Creator                         : Romain Guy

Test: doesn't really apply to images

Change-Id: I3b9503efab871600512840531b477d3226432d58