Build Linux IMAGE for IMX.6

Build a distribution for a solid run imx6 SOM on a custom board that is inspired by the humming board. * distribution should be based on [login to view URL]:imx6:software:os:debian (could maybe also be yocto based, if there is a good reasons for it) * configure u-boot to load custom device tree (auto detect imx6q or imx6dl) * clean up / improve the device tree (working tree exists but needs cleanup and maybe improving) * read only root partition and a r/w partition for our custom java app * autostart X-server (hide mouse pointer and without screensaver) * autostart the java software * network configurable via file on the r/w filesystem * basic security setup (ssh, iptables) * remove all none required packages * disable logging to file * custom splash screen on startup * easy way to flash the image onto the SOM * strategy for how updates could be deployed (custom kernel, security relevant packages like ssh) * maybe have 2 root partitions (update the other, only switch boot to it if successful) * cross compile linux_libnfc-nci and a custom small c application based on this lib (can currently only be compiled on the device directly) We also use a custom kernel (based on [login to view URL]) that only adds the pn544 nfc driver ([login to view URL]), a configuration for the display and uses a custom device tree.