KeyError regarding 32-bit ARM loading

### Description

Logs:

```
Exception while running job "Loading file":
Traceback (most recent call last):
File "angrmanagement\data\instance.py", line 343, in _worker
File "angrmanagement\data\jobs\job.py", line 69, in run
File "angrmanagement\data\jobs\loading.py", line 124, in _run
File "angr\project.py", line 227, in __init__
File "angr\factory.py", line 39, in __init__
File "angr\engines\pcode\cc.py", line 113, in register_pcode_arch_default_cc
File "angr\calling_conventions.py", line 2293, in default_cc
KeyError: 'arm32'
```

### Steps to reproduce the bug

The Windows Nightly build fails to load any file that is selected with all P-code 32-bit ARM values on the current Windows nightly release.

Backend: blob

### Environment

_No response_

### Additional context

_No response_