Split tricore and riscv build condition in librz/arch/meson.build, allowing different minimum capstone versions

[moste00]

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Detailed description

The recent RISC-V PR #5482 accidentally made tricore's build condition too strict, as it needed RISC-V's condition to be tightened to only build on v6 and next (excluding v4 and v5) and tricore was bundled with it under the same condition.

This broke no test but it's unnecessary, this PR restores the build condition of tricore to all versions of Capstone again.

Test plan

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Closing issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.83%. Comparing base (4c3230c) to head (c8f4354).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

see 9 files with indirect coverage changes

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