BDM: Make loading block device modules other than USB optional

[KrahJohlito]

Pull Request checklist

Note: these are not necessarily requirements

• I reformatted the code with clang-format
• I checked to make sure my submission worked
• I am the author of submission or have permission from the original author
• Requires update of the PS2SDK
• Requires update of the gsKit
• Others (please specify below)

Pull Request description

This is just to make loading of additional block device modules optional, I tested and it works fine.

I did originally have an option for USB on/off also but it was more hassle than its worth as it appears one set of modules must be loaded otherwise I would just get BSOD when loading BDM modules..so the obvious choice is to have USB as the default block device and all others IEEE 1394, MX4SIO & UDP optional.

I don't see any point in adding language strings for names of things, devices etc since..they would always be the same so FireWire is hardcoded..as seen below.

[AKuHAK]

I still like to see that any new GUI option is mentioned somewhere in some readme file :)

[uyjulian]

Looks OK codewise

[rickgaiser]

Thank you @KrahJohlito , merging.