kirkwood: fix compatible string in ib62x0 dts

There is no point in being that specifc in a generic dts covering a range
of boards. Keep only the the generic compat string to use it for a
devicetree based boardname.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/kirkwood/patches-4.9/100-ib62x0.patch

@@ -1,5 +1,14 @@
 --- a/arch/arm/boot/dts/kirkwood-ib62x0.dts
 +++ b/arch/arm/boot/dts/kirkwood-ib62x0.dts
+@@ -5,7 +5,7 @@
+ 
+ / {
+ 	model = "RaidSonic ICY BOX IB-NAS62x0 (Rev B)";
+-	compatible = "raidsonic,ib-nas6210-b", "raidsonic,ib-nas6220-b", "raidsonic,ib-nas6210", "raidsonic,ib-nas6220", "raidsonic,ib-nas62x0", "marvell,kirkwood-88f6281", "marvell,kirkwood";
++	compatible = "raidsonic,ib-nas62x0", "marvell,kirkwood-88f6281", "marvell,kirkwood";
+ 
+ 	memory {
+ 		device_type = "memory";
 @@ -117,13 +117,13 @@
  	};