ARM: dts: kirkwood: add kirkwood-nsa320.dtb to Makefile

commit 9ec423ed upstream.

Commit be3d7d02 ("ARM: kirkwood: Add DTS file for NSA320")
created the new file kirkwood-nsa320.dts but did not
add it to the Makefile.

Fixes: be3d7d02 ("ARM: kirkwood: Add DTS file for NSA320")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

arch/arm/boot/dts/Makefile

@@ -132,6 +132,7 @@ kirkwood := \
 	kirkwood-ns2mini.dtb \
 	kirkwood-nsa310.dtb \
 	kirkwood-nsa310a.dtb \
+	kirkwood-nsa320.dtb \
 	kirkwood-openblocks_a6.dtb \
 	kirkwood-openblocks_a7.dtb \
 	kirkwood-openrd-base.dtb \