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Updating this article that was written dealing with the extra partition that MDT creates when you deploy your Operating System.
[Update]
If you forgot to add the DoNotCreateExtraPartition within your CustomSettings.ini file and you want to delete the partition and extend your primary partition following these steps:
Open your command prompt and type in the following: bcdboot c:\windows /s c:
Once that has successfully completed you will need to make your primary partition Active. So right-click on your C drive partition and set it as Active. Reboot the machine and go back into the Computer Management console and right-click on the BDEdrive and delete it. Now, right-click on the C: drive partition – you should be able to extend the partition now.