fix(ch32v): select D8 startup for V203RB

[zackees]

Closes #1121\n\nUse the CH32V203xB selector for the V203RB board so the startup/vector table matches its D8 HAL configuration. This is a deliberate divergence from Community-PIO parity documented by the issue.\n\nValidation: git diff --check.

Summary by CodeRabbit

• Bug Fixes
  • Updated the Arduino OpenWCH build configuration for CH32V203 boards to use the correct processor definition.
  • Improved compatibility and build reliability for the affected board variant.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 0c2fc332-89a6-40c2-8e48-476ff242463c

📥 Commits

Reviewing files that changed from the base of the PR and between d11a05a and db703e3.

📒 Files selected for processing (1)

• crates/fbuild-config/assets/boards/json/genericCH32V203RBT6.json

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📝 Walkthrough

Walkthrough

The CH32V203RB Arduino OpenWCH board configuration changes its preprocessor define from -DCH32V203 to -DCH32V203xB, with all other extra flags unchanged.

Changes

CH32V203RB configuration

Layer / File(s)	Summary
Update CH32V203RB build flags crates/fbuild-config/assets/boards/json/genericCH32V203RBT6.json	Replaces the -DCH32V203 extra flag with -DCH32V203xB.

Estimated code review effort: 1 (Trivial) | ~2 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/1121-ch32v203rb-startup

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