ARM: dts: kirkwood: use unique machine name for ds112

Downstream packages like Debian flash-kernel use
/proc/device-tree/model
to determine which dtb file to install.

Hence each dts in the Linux kernel should provide a unique model
identifier.

Commit 2d0a7addbd10 ("ARM: Kirkwood: Add support for many Synology NAS
devices") created the new files kirkwood-ds111.dts and kirkwood-ds112.dts
using the same model identifier.

This patch provides a unique model identifier for the
Synology DiskStation DS112.

Fixes: 2d0a7addbd10 ("ARM: Kirkwood: Add support for many Synology NAS devices")
Signed-off-by: Heinrich Schuchardt <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

arch/arm/boot/dts/kirkwood-ds112.dts

···
 #include "kirkwood-synology.dtsi"
 
 / {
-	model = "Synology DS111";
+	model = "Synology DS112";
 	compatible = "synology,ds111", "marvell,kirkwood";
 
 	memory {