use immediate set in target Makefiles

No functional change, it's just to have the same style everywhere. This
way I don't need to use any regex magic to extract all subtargets for
compile tests.

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

target/linux/ar71xx/Makefile

@@ -10,7 +10,7 @@ ARCH:=mips
 BOARD:=ar71xx
 BOARDNAME:=Atheros AR7xxx/AR9xxx
 FEATURES:=mips16
-CPU_TYPE=24kc
+CPU_TYPE:=24kc
 SUBTARGETS:=generic nand mikrotik
 
 KERNEL_PATCHVER:=4.4

target/linux/au1000/Makefile

@@ -10,7 +10,7 @@ ARCH:=mipsel
 BOARD:=au1000
 BOARDNAME:=RMI/AMD AU1x00
 FEATURES:=squashfs usb pci
-SUBTARGETS=au1500 au1550
+SUBTARGETS:=au1500 au1550
 MAINTAINER:=Florian Fainelli <florian@openwrt.org>
 
 KERNEL_PATCHVER:=3.18

target/linux/ixp4xx/Makefile

@@ -11,7 +11,7 @@ BOARD:=ixp4xx
 BOARDNAME:=Intel IXP4xx
 FEATURES:=squashfs
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
-SUBTARGETS=generic harddisk
+SUBTARGETS:=generic harddisk
 
 KERNEL_PATCHVER:=4.4
 

target/linux/lantiq/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 BOARD:=lantiq
 BOARDNAME:=Lantiq
 FEATURES:=squashfs
-SUBTARGETS=xrx200 xway xway_legacy
+SUBTARGETS:=xrx200 xway xway_legacy
 MAINTAINER:=John Crispin <john@phrozen.org>
 
 KERNEL_PATCHVER:=4.4

target/linux/mpc85xx/Makefile

@@ -12,7 +12,7 @@ BOARDNAME:=Freescale MPC85xx
 CPU_TYPE:=8540
 FEATURES:=squashfs
 MAINTAINER:=Imre Kaloz <kaloz@openwrt.org>
-SUBTARGETS=generic p1020
+SUBTARGETS:=generic p1020
 
 KERNEL_PATCHVER:=4.4
 

target/linux/x86/Makefile

@@ -10,7 +10,7 @@ ARCH:=i386
 BOARD:=x86
 BOARDNAME:=x86
 FEATURES:=squashfs ext4 vdi vmdk pcmcia targz fpu
-SUBTARGETS=generic legacy xen_domu geode 64
+SUBTARGETS:=generic legacy xen_domu geode 64
 MAINTAINER:=Felix Fietkau <nbd@nbd.name>
 
 KERNEL_PATCHVER:=4.4

target/linux/xburst/Makefile

@@ -14,7 +14,7 @@ SUBTARGETS:=qi_lb60
 
 KERNEL_PATCHVER:=3.18
 
-DEVICE_TYPE=other
+DEVICE_TYPE:=other
 
 define Target/Description
 	Build firmware images for XBurst JZ47x0 based boards.