Thanks @Manish Patel for your patience. I got confirmation from Product team that it is not possible to specify tenant information while connecting to Azure DevOps repository from ADF. One workaround I can think of but not sure is to create an GIT Repository that can be shared permissions with both the tenants.
I would recommend to submit an idea in feedback forum that will be closely monitored by ADF Product team and implemented in future releases.
Hope this helps!