avr32: update default configuration files for Atmel boards

This patch adjusts some values to make the default configuration for Atmel
boards more similar, and adds missing values to enable required functions. Also
remove defined symbols for functions not in use.

Signed-off-by: Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>

diff --cc arch/avr32/configs/atngw100_defconfig
Simple merge

diff --cc arch/avr32/configs/atngw100_evklcd100_defconfig
Simple merge

diff --cc arch/avr32/configs/atngw100_evklcd101_defconfig
Simple merge

diff --cc arch/avr32/configs/atngw100mkii_defconfig
Simple merge

diff --cc arch/avr32/configs/atngw100mkii_evklcd100_defconfig
Simple merge

diff --cc arch/avr32/configs/atngw100mkii_evklcd101_defconfig
Simple merge

diff --cc arch/avr32/configs/atstk1002_defconfig
Simple merge

diff --cc arch/avr32/configs/atstk1003_defconfig
Simple merge

diff --cc arch/avr32/configs/atstk1004_defconfig
Simple merge

diff --cc arch/avr32/configs/atstk1006_defconfig
Simple merge