karo: tx6: remove obsolete TX6Q-1020
karo: tx6: introduce generic TARGET_EMMC/TARGET_NAND to simplify Kconfig
karo: tx6: add support for boards with >= 2GiB memory
kconfig: arm: move ARCH_MX? out of choice which selects TARGETs that depend on those
karo: tx6: cleanup defconfig files
karo: cleanup after merge of v2015.10-rc2
karo: tx6: implement secure boot support