Remove connectivity-tiramisu-updatable-sources

The filegroup is now unnecessary as files are all in the service-t/src
directory.

This change allows building all sources including ethernet by
referencing src/**. This is done by using a general filegroup
service-connectivity-tiramisu-sources, so that branches that cannot
build the T+ code can change its contents without introducing merge
conflicts in the rest of the build rules.

Also change visibility rules to allow building the moved ethernet code,
and add a filegroup to allow building its tests.

Bug: 222234190
Test: TH
Merged-In: I770bf8db3f4c18467934eb2184f5dc2408fc28ec
Merged-In: I3e5df1bd44defbb9dd0c382c625a21e176368f2a
Change-Id: I8f23a45800b1086cc5a765fd24d734ca82c339a8
3 files changed