gamecontrollerdb: map retrogame_joypad by label like the other built-in pads

[qzydustin]

Summary

What does this PR do?

The retrogame_joypad line in gamecontrollerdb maps A/B by position but X/Y by label (a:b0,b:b1,x:b2,y:b3), while es_input.cfg and every other built-in pad map all four by label. So on these devices Circle is on the bottom button in PPSSPP (RG351P/M, G350) and DuckStation, and the GameCube X/Y are swapped in Dolphin.

Revert the A/B change of c1fd2da (a:b1,b:b0), drop the RK3566 PPSSPP Circle/Cross swap that made up for it, and swap it back in existing RK3566 controls.ini on update. With this, the retrogame_joypad devices map the same way as every other built-in pad, and RK3566 uses the same PPSSPP controls as the other platforms.

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Testing & Verification

• Device(s) Tested: none with retrogame_joypad
• Build Artifacts / Commit: 6274d02

Test Steps

1. Circle in PPSSPP and DuckStation, X/Y in Dolphin.

Test Results & Evidence

Needs a tester. Most ports use /tmp/gamecontrollerdb.txt, which mapper.txt builds from es_input.cfg and the controller_layout setting, so they don't change (checked on an R36S clone); the Moonlight port and Ikemen read the system db directly and follow this change.

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Additional Context & Reviewer Notes

History in the first comment.

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AI Assistance Disclosure

• No Written entirely without AI tools.
• Partially AI was used for minor assistance (e.g., refactoring, writing tests, debugging, documentation).
• Yes AI generated a major portion of the code or implementation.

[qzydustin]

History (distribution-old hashes):

• JELOS added the line as a:b1,b:b0 (8166454), the same as SDL_GameControllerDB, es_input.cfg and the RetroArch autoconfig.
• 6dcf143 swapped Circle/Cross in the RK3566 PPSSPP controls; the RK3326 ones were never changed.
• c1fd2da changed the line to a:b0,b:b1.

On all these boards the button printed A is BTN_EAST (b1): mainline rk3566-anbernic-rg353x.dtsi and rk3566-powkiddy-rk2023.dtsi have button-a = GPIO3_C2 = BTN_EAST, the same as our trees.

[qzydustin]

Split the commander change into its own PR; this one now only fixes the retrogame_joypad line.