feat: add ONEXPLAYER 3 device definition

[Grippy98]

Summary

• Add DMI detection for the ONEXPLAYER 3
• Add the onexplayer_3 device variant
• Configure the device to use PowerStation for TDP control
• Add a hardware lookup test for its DMI identifiers

Hardware details

• System vendor: ONE-NETBOOK
• Product name: ONEXPLAYER 3
• TDP range: 8–35 W

A companion PowerStation change adds the required Intel RAPL MMIO handling and ONEXPLAYER 3 TDP limits.
ShadowBlip/PowerStation#40

Testing

• The ONEXPLAYER 3 hardware lookup test passes
• Live-tested device detection and TDP limits on an ONEXPLAYER 3 running Bazzite 44
• Confirmed 8 W minimum and 35 W maximum through steamosctl
• Confirmed TDP writes were applied through PowerStation
• Full test run: 251 tests passed; 11 unrelated existing/environment-dependent tests failed

AI assistance disclosure

This change was developed with assistance from OpenAI Codex. The resulting code was reviewed, tested, and validated on physical ONEXPLAYER 3 hardware by me.

[yoyossef]

Any hope to see TDP lower than 8W? The OXP3 should perform well for very power efficient activites.

[Grippy98]

Yes it should be possible since the firmware accepts lower (and higher) values but I went with something safe for the time being. With more testing it should be safe to just set a lower value or go up to 40W on the higher end like OXP lets you set it in Windows.