Android: Fix unmapped joysticks (default joystick buttonmaps)

[garbear]

Description

Android ships buttonmaps for hundreds of controllers. When A is pressed, we get the keycode AKEYCODE_BUTTON_A because Android has a buttonmap for this controller.

This PR harnesses Android buttonmaps by extending the default maps for keyboard and mice added in #24512, allowing a default map for joysticks to come from the peripheral bus.

The PR is separated into 4 commits:

• Commits 1-3: Code improvements depended on by the fix
• Commit 4: Fixes unmapped joysticks

Motivation and context

Fixes virtually every unmapped controller that Android can map.

Broken out from #24604

How has this been tested?

Tested as part of my RetroPlayer builds since January: https://github.com/garbear/xbmc/releases

Reports confirm that unmapped joysticks work in Kodi without needing to be mapped.

What is the effect on users?

• Added buttonmaps for non-generic controllers

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• Student submission (PR was done for educational purposes and will be treated as such)
• None of the above (please explain below)

[garbear]

Rebased after merging #25174.