Add BHUSA2024 UEFI OROM Backdoor talk & Bootkitty

[kazuki-matsuo-ffri]

Thank you for managing such a valuable repository. I often refer to it myself.
This PR includes the following two additions. I would appreciate it if you could consider adding them:

• Talks: A presentation on the UEFI OROM Backdoor from this year's Black Hat USA.
• Bootkits: Since a UEFI malware targeting Linux emerged this November, I’d like to include that as well.