net: mctp: Add bind lookup test

Test the preference order of bound socket matches with a series of test
packets.

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Link: https://patch.msgid.link/20250710-mctp-bind-v4-8-8ec2f6460c56@codeconstruct.com.au


Signed-off-by: Paolo Abeni <pabeni@redhat.com>