Add PSP's PSX BIOS signature
AS PSP owner, I WANT TO use my PS1 bios dumped from my own PSP, IN ORDER TO play PSX games in Recalbox without having to download a BIOS from the Internet.
The easiest way to dump a PSX bios is to dump it from a PSP. The obtained bios is working perfectly (I've tested it in a bunch of emulators incl. PCSX-Rearmed in Recalbox).
The "issue" is that the signature of this bios is not recognized by Recalbox and then the warning saying that "no valid bios has been found" appears when a PSX game is launched.
By supporting this bios signature, the warning would not be displayed anymore.
Here's the signature of this bios : Size: 524288 bytes (512 KiB) CRC32: 5660F34F MD5 : C53CA5908936D412331790F4426C6C33 SHA1: 96880D1CA92A016FF054BE5159BB06FE03CB4E14