[AArch64] Update system registers based on ARM's 2025-09 data

This change consists of two parts:
1. Updating the system register enumeration and names based on the
   latest data from ARM.
2. Removing register names that conflict with the official names from
   ARM.

The conflicting register names came a data set of Apple-specific system
register names. These would ideally not be baked into the AArch64
disassembler at all, but would be added by Binary Ninja's Apple
platform. The exact mechanism for doing that is still TBD.

Fixes #7664.

Author: bdash