Rethinked and revised this function.
This previous one worked by "accident".
More a sheer luck of offsets on current firmware (as of writing)
But now, this is more mathematically correct way of creating a
THUMB -> ARM BLX instruction.
Also setting the new op in a set of 2 u16,
because patching code is in thumb.
Patch it to call __rt_memclr instead of internal PRNG when generating Key
and IV.
Only if UNITINFO is set, preventing on regular console usage NIM sending
to nintendo a 0 Key and IV, and allowing nintendo to know who has a
patched console.