Remove TODO for service registration.

Using getRawServiceInternal is fine here. It would be ideal if
getService/registerAsService were methods on IBase (and no subchildren
implemented these), but this would break prebuilts, and so it isn't
worth it.

Fixes: 118394906
Test: N/A

Change-Id: Idec703f355013531e1f9b8cceee0651b5af43cee
1 file changed