Add patches for bios_extract

This updates the dell_inspiron_1100.py script from Python 2 to 3 for
better compatibility (some distros have dropped Python 2), and adds
special handling so that it works with the Latitude E6400 BIOS.

These have also been sent upstream, so these patches can be dropped
once they are merged:
https://review.coreboot.org/c/bios_extract/+/74975/
https://review.coreboot.org/c/bios_extract/+/74976/
https://review.coreboot.org/c/bios_extract/+/74977/