Update xconfig to support Kavari (Radeon R5).

[xcrsz]

Summary by Sourcery

Add support for AMD Kaveri (Radeon R5) by updating xconfig detection logic and providing a new configuration template.

New Features:

• Detect AMD Kaveri (Radeon R5) hardware in the xconfig tool
• Include a new XF86Config.kaveri template for configuring Kaveri APUs

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Hey there - I've reviewed your changes and they look great!

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[ericbsd]

LGTM

The merge-base changed after approval.