[source] arc770: fix parallel build issue

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/1b17f4f2609b822ce1225bb205794085072097c7

commit 1b17f4f2609b822ce1225bb205794085072097c7
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Jan 11 11:20:25 2017 +0100

    arc770: fix parallel build issue
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 target/linux/arc770/image/Makefile | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/target/linux/arc770/image/Makefile b/target/linux/arc770/image/Makefile
index 3b124c2..4f8fbff 100644
--- a/target/linux/arc770/image/Makefile
+++ b/target/linux/arc770/image/Makefile
@@ -14,10 +14,6 @@ define Build/calculate-ep
 	$(eval KERNEL_ENTRY=$(shell $(KERNEL_CROSS)readelf -h $(1) | grep "Entry point address" | grep -o 0x.*))
 endef
 
-define Build/build-dtb
-	$(call Image/BuildDTB,$(DTS_DIR)/$(DEVICE_DTS).dts,$(DTS_DIR)/$(DEVICE_DTS).dtb)
-endef
-
 define Build/patch-dtb
 	$(STAGING_DIR_HOST)/bin/patch-dtb $@ $(DTS_DIR)/$(DEVICE_DTS).dtb
 endef
@@ -26,7 +22,7 @@ ifneq ($(CONFIG_TARGET_ROOTFS_INITRAMFS),)
 # Root FS built-in
 define Device/vmlinux
 	KERNEL_SUFFIX := .elf
-	KERNEL := kernel-bin | build-dtb | patch-dtb
+	KERNEL := kernel-bin | patch-dtb
 	KERNEL_INITRAMFS_NAME = vmlinux-initramfs.elf
 endef
 
@@ -40,7 +36,7 @@ endif
 
 # Root FS on SD-card
 KERNEL_LOADADDR := 0x80000000
-DEVICE_DTS_LIST:= axs101
+DEVICE_DTS_LIST:= axs101 nsim_700
 FAT32_BLOCK_SIZE=1024
 FAT32_BLOCKS=$(shell echo $$(($(CONFIG_AXS10X_SD_BOOT_PARTSIZE)*1024*1024/$(FAT32_BLOCK_SIZE))))
 
@@ -74,7 +70,9 @@ define Image/BuildKernel
 	)
 
 	# Build .dtb for all boards we may run on
-	$(foreach DEVICE_DTS,$(shell echo $(DEVICE_DTS_LIST)), $(call Build/build-dtb))
+	$(foreach dts,$(DEVICE_DTS_LIST),
+		$(call Image/BuildDTB,$(DTS_DIR)/$(dts).dts,$(DTS_DIR)/$(dts).dtb)
+	)
 endef
 
 define Image/Build