target/device/ARM: don't override busybox config

target/device/ARM/Makefile.in

@@ -34,9 +34,6 @@ LINUX26_COPYTO:=/tftpboot
 # The board specific Makefile.in can redefine BOARD_NAME's
 LINUX_BOARD_NAME:=$(BOARD_NAME)
 
-BR2_PACKAGE_BUSYBOX_CONFIG:=$(BOARD_PATH)/busybox.config
-
-
 # Needs to be AFTER board specific Makefiles
 
 arm_status: