Revert "tests/driver_at25xxx: adapt to change in driver API"
Revert "tests/driver_at25xxx: adapt to change in driver API"

This reverts commit 6ca7ac949a8768b2c5307f77bdcb581679b059cd.

OlegHahm/RIOT,miri64/RIOT,OlegHahm/RIOT,jasonatran/RIOT,ant9000/RIOT,OlegHahm/RIOT,jasonatran/RIOT,basilfx/RIOT,basilfx/RIOT,basilfx/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,kaspar030/RIOT,ant9000/RIOT,OTAkeys/RIOT,basilfx/RIOT,jasonatran/RIOT,kYc0o/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kaspar030/RIOT,authmillenon/RIOT,miri64/RIOT,authmillenon/RIOT,authmillenon/RIOT,miri64/RIOT,kaspar030/RIOT,kaspar030/RIOT,miri64/RIOT,OlegHahm/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,miri64/RIOT,authmillenon/RIOT,authmillenon/RIOT,kYc0o/RIOT,kaspar030/RIOT,OTAkeys/RIOT,kYc0o/RIOT,basilfx/RIOT,authmillenon/RIOT,ant9000/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,OTAkeys/RIOT,kYc0o/RIOT,OTAkeys/RIOT,OlegHahm/RIOT,ant9000/RIOT