2018-06-29  Pitchumani Sivanupandi <pitchumani.sivanupandi@microchip.com>

	Patch #9659: Update eeprom_is_ready for avrxmega3 devices
	* include/avr/eeprom.h (eeprom_is_ready): Replace xmega specific definition
	with NVM control register based definition as the names are not same for
	all xmega devices.

