[source] kirkwood: clean up redundant variables in the image building code

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/?p=source.git;a=commitdiff;h=5d4b04495502b326592c94a364bcd2cde65439ba

commit 5d4b04495502b326592c94a364bcd2cde65439ba
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Jul 19 16:38:25 2016 +0200

    kirkwood: clean up redundant variables in the image building code
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 target/linux/kirkwood/image/Makefile | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/target/linux/kirkwood/image/Makefile b/target/linux/kirkwood/image/Makefile
index 5776c2e..a532b48 100644
--- a/target/linux/kirkwood/image/Makefile
+++ b/target/linux/kirkwood/image/Makefile
@@ -23,18 +23,20 @@ define Device/Default
   KERNEL_NAME := zImage
   KERNEL_SUFFIX  := -uImage
   KERNEL_INSTALL := 1
-endef
 
-define Device/dockstar
-  DEVICE_DTS := kirkwood-dockstar
   PAGESIZE := 2048
   SUBPAGESIZE := 512
   BLOCKSIZE := 128KiB
+  IMAGES := sysupgrade.tar
+  IMAGE/sysupgrade.tar := sysupgrade-nand
+endef
+
+define Device/dockstar
+  DEVICE_DTS := kirkwood-dockstar
   FILESYSTEMS := squashfs
   PROFILES := Generic DOCKSTAR
-  IMAGES := factory.bin sysupgrade.tar
+  IMAGES += factory.bin
   IMAGE/factory.bin := append-ubi
-  IMAGE/sysupgrade.tar := sysupgrade-nand
   KERNEL_IN_UBI := 1
   KERNEL := kernel-bin | append-dtb
 endef
@@ -53,28 +55,20 @@ endef
 
 define Device/linksys-audi
   DEVICE_DTS := kirkwood-linksys-audi
-  PAGESIZE := 512
-  SUBPAGESIZE := 256
-  BLOCKSIZE := 16KiB
   KERNEL_SIZE := 2624k
   FILESYSTEMS := squashfs
   PROFILES := Generic AUDI
-  IMAGES := factory.bin sysupgrade.tar
+  IMAGES += factory.bin
   IMAGE/factory.bin := append-kernel $$$$(KERNEL_SIZE) | append-ubi
-  IMAGE/sysupgrade.tar := sysupgrade-nand
 endef
 
 define Device/linksys-viper
   DEVICE_DTS := kirkwood-linksys-viper
-  PAGESIZE := 2048
-  SUBPAGESIZE := 512
-  BLOCKSIZE := 128KiB
   KERNEL_SIZE := 2688k
   FILESYSTEMS := squashfs
   PROFILES := Generic VIPER
-  IMAGES := factory.bin sysupgrade.tar
+  IMAGES += factory.bin
   IMAGE/factory.bin := append-kernel $$$$(KERNEL_SIZE) | append-ubi
-  IMAGE/sysupgrade.tar := sysupgrade-nand
 endef
 
 define Image/BuildKernel/Template