avr32: add atngw100mkii board

This patch is derived from an older patch provided by atmel in its
buildroot-avr32-v3.0.0.tar.bz2

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
diff --git a/MAINTAINERS b/MAINTAINERS
index 4aabcff..cd18732 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1112,6 +1112,7 @@
 
 Andreas Bießmann <andreas.devel@googlemail.com>
 	grasshopper		AT32AP7000
+	atngw100mkii		AT32AP7000
 
 Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>