Added Hans-Christian Egtvedt as maintainer for the AVR32 architecture

MAINTAINERS

@@ -32,6 +32,13 @@ W:	http://www.arm.linux.org.uk/
 S:	Maintained
 
 
+AVR32
+N:	Hans-Christian Egtvedt
+E:	hcegtvedt@atmel.com
+W:	http://avr32linux.org/
+S:	Maintained
+
+
 BFIN
 N:	Mike Frysinger
 E:	vapier.adi@gmail.com