imx: split into arch-specific subtargets

Modern NXP i.MX series includes several different families, based on
single- or multi-core Arm Cortex-A CPUs. To be able to support more
families within a single target, we split the 'imx' in arch-specific
subtargets, starting with 'cortexa9' for the Cortex-A9 based i.MX 6,
already supported by the original 'imx6' target.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

target/linux/imx/base-files/etc/board.d/02_network

@@ -1,46 +0,0 @@
-#
-# Copyright (C) 2013-2015 OpenWrt.org
-#
-
-. /lib/functions/uci-defaults.sh
-
-board=$(board_name)
-
-board_config_update
-
-case "$board" in
-gw,imx6dl-gw51xx |\
-gw,imx6dl-gw52xx |\
-gw,imx6dl-gw5904 |\
-gw,imx6dl-gw5907 |\
-gw,imx6dl-gw5910 |\
-gw,imx6dl-gw5912 |\
-gw,imx6dl-gw5913 |\
-gw,imx6q-gw51xx |\
-gw,imx6q-gw52xx |\
-gw,imx6q-gw5904 |\
-gw,imx6q-gw5907 |\
-gw,imx6q-gw5910 |\
-gw,imx6q-gw5912 |\
-gw,imx6q-gw5913 |\
-solidrun,cubox-i/dl |\
-solidrun,cubox-i/q )
-	ucidef_set_interface_lan 'eth0'
-	;;
-gw,imx6dl-gw53xx |\
-gw,imx6dl-gw54xx |\
-gw,imx6dl-gw552x |\
-gw,imx6q-gw53xx |\
-gw,imx6q-gw5400-a |\
-gw,imx6q-gw54xx |\
-gw,imx6q-gw552x )
-	ucidef_set_interfaces_lan_wan 'eth0' 'eth1'
-	;;
-wand,imx6dl-wandboard )
-	ucidef_set_interface_wan 'eth0'
-	;;
-esac
-
-board_config_flush
-
-exit 0