[Feature Request] ARMSX2 core

LRPS2 is a libretro core that is a heavily customized fork of PCSX2, serving as the only PlayStation 2 libretro core. However, it is not available for RetroArch on Android via the usual Main Menu → Online Updater → Core Downloader path, so Android users currently lack a PS2 libretro core option. There are no official PCSX2 releases for Android, which explains why LRPS2 only targets desktop RetroArch releases. Meanwhile, ARMSX2, another fork of PCSX2 designed specifically for ARM devices, is an intriguing candidate for Android-based PS2 emulation.

It should be noted that ARMSX2 currently is unstable, encountering crashes and freezes on certain devices as reported in issue discussions and user testing (see https://github.com/ARMSX2/ARMSX2/issues/40). However, the development team is actively working on fixes and improvements, with plans to address GPU compatibility and update the underlying PCSX2 core. Given the ongoing development and roadmap, it's expected that these stability issues will be resolved over time, making the emulator more reliable for PS2 gaming on Android devices soon.

Please add the "core requests - not retroarch bugs" label to this issue.

Start with RetroArch’s Main Menu → Online Updater → Core Downloader path and review ARMSX2 issue 40 for the reported Android stability concerns. Done means ARMSX2 is available as an Android RetroArch core option, with compatibility and integration requirements resolved.