Replace pcduino.fex with fex file extracted from script.bin

The old pcduino.fex produces a kernel panic. The new one was extracted from the script.bin found in the hardware pack from the original pcduino site (at https://s3.amazonaws.com/pcduino/Images/2013-05-31/pcduino_a10_hwpack_20130529.tar.xz), using the bin2fex utility, and doesn't produce a kernel panic.