config: add devtmpfs

for partition type auto-detection
config: version -that10

also simplify the version string, it's unlikely that we get anything
after 10.6.1.14.10 from Asus.
logo: add Android Tux bootlogo
config: use Android Tux bootlogo
asusdec: add key_flags for PC-like keyboard

thanks to cogano for inspiration:
http://forum.xda-developers.com/showpost.php?p=52202432&postcount=728
cpu-tegra: fix warnings (sloppy code by Asus)
cpu-tegra: remove overclock mode, make balanced+perf clocks configurable
asusdec: add key_autorepeat parameter

should make native linuxers happy