RTEMS | testsuites/psxtests: psxaio05 fails on ZynqMP (#5227)

[Kinsey Moore (@opticron)]

Kinsey Moore commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5227#note_120744


Upon closer inspection, this may be a codegen bug. There is a comparison followed by a branch high:
```
// w0 is 3
cmp w0, #1 // translates to a subtraction with zero-register as the target which clears condition flag Z (result is non-zero) and sets condition flag C (subtraction didn't cause a borrow)
b.hi 0x1cd7c // branches when Z is clear and C is set
```

The branch is taken as expected from the assembly, but that doesn't match the logic in the source. Correct codegen would likely avoid the preceding subtraction and use a `b.gt`, instead.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5227#note_120744
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