manifest: Remove repositories serviceable by roomservice

Let's be nice to github (and avoid getting locked out again).
CM7 has supported roomservice for months, there's no reason for its
configuration to be different from CM9 and above.
There's no need to pull these 88 repositories when bootstrapping
CM7. It's over 6GB worth of data that's useless when you want to
build a single device.

Change-Id: I75cad7a78d41c2abe8db6f3443fa0efae8a50b32