fix device_table.txt path in arm_toolchain_defconfig

Signed-off-by: Chih-Min Chao <cmchao@gmail.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/arm_toolchain_defconfig

@@ -712,7 +712,7 @@ BR2_PACKAGE_XSERVER_none=y
 #
 # filesystem for target device
 #
-BR2_ROOTFS_DEVICE_TABLE="target/device/generic/device_table.txt"
+BR2_ROOTFS_DEVICE_TABLE="target/generic/device_table.txt"
 # BR2_TARGET_ROOTFS_CRAMFS is not set
 # BR2_TARGET_ROOTFS_CLOOP is not set
 # BR2_TARGET_ROOTFS_EXT2 is not set