DEV9: Improve DVE Emulation

[SlimPugGamer]

Description of Changes

Adds a missing DVE syscall (0x44) that fixes crashes with certain PS2's

Rationale behind Changes

Games crashing is bad

Suggested Testing Steps

Test if games that use the DVE boot and work properly

Did you use AI to help find, test, or implement this issue or feature?

No

[F0bes]

The PR description is bad. I don't know what you did, how you came to this conclusion, and what was originally broken.

Your rationale is "games crashing is bad", and the testing steps are "make sure games don't crash". The problem is, games aren't crashing because of this. So what does it actually fix?

Also, I'm not going to merge low level changes like this without hardware testing.