avr32: add unaligned.h

This patch fixes following error:

zlib.c:31:27: error: asm/unaligned.h: No such file or directory

Suggested-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Andreas Bießmann <biessmann@corscience.de>
diff --git a/arch/avr32/include/asm/unaligned.h b/arch/avr32/include/asm/unaligned.h
new file mode 100644
index 0000000..6cecbbb
--- /dev/null
+++ b/arch/avr32/include/asm/unaligned.h
@@ -0,0 +1 @@
+#include <asm-generic/unaligned.h>