#0: make codeowners of matmul and experimental matmul the same

[bbradelTT]

Ticket

Link to Github Issue N/A

Problem description

• Owners of experimental/matmul and matmul should be the same.

What's changed

• make the codeowners the same

Checklist

• Post commit CI passes N/A
• Blackhole Post commit (if applicable) N/A
• Model regression CI testing passes (if applicable) N/A
• Device performance regression CI testing passes (if applicable) N/A
• New/Existing tests provide coverage for changes N/A