This adds the ATmega256RFR2 to the list of know devices for flashing. Change-Id: Ib24a508762aaa84ba08ba37409db2ae674b46288 Signed-off-by: Lars Pöschel <poeschell+openocd@mailbox.org> Reviewed-on: http://openocd.zylin.com/5504 Tested-by: jenkins Reviewed-by: Tomas Vanek <vanekt@fbl.cz>