Support for GPUs older than pascal

[RavenX8]

I have tested this using maxwell cards. To convert an NVIDIA vBIOS for VFIO, you do not need to remove the footer (even for pascal cards). The changes I have made here allow you to disable the checks looking for the footer, therefore allowing you to convert an older card for VFIO.

[Matoking]

Thanks for posting this pull request.

I tested this pull request by downloading VBIOSes from TechPowerup and checking if they correspond to the vBIOS dumps posted here. The dumps this script generates include some footer data that's not present in the user-submitted dumps over at Unraid forums, such as a very prominent -----BEGIN CERTIFICATE----- section that you can see in dumps downloaded from TechPowerup.

As you said, including the rest of the ROM is probably not a problem, but I'd like to have another confirmation just to be sure before merging this.

[RavenX8]

No problem. I had actually used the vBIOSes from TechPowerup and even dumping from my cards directly. They also included the certs.

[MrMeeb]

Hi, since you were looking for another confirmation, I tested this script with a GT710 and it worked perfectly, both when using a BIOS from techpowerup, and using my own BIOS pulled using GPU-Z