manifest: Remove device-specific repos

This is what the previous patch SHOULD have been - remove device
and kernel trees but not remove hardware/X which are fairly small
repos and have not been removed by any other project.

Having 50 entries in the dependencies file, including repos which
are used by multiple devices from multiple OEMs, is just insane.

Change-Id: Iaad0b5d42d218ce7c4f730b220fbf1dd510c688b
Merge "manifest: Remove device-specific repos" into android-4.4