Fix race condition that adapter does not get handleEngineUp

- Removed redundant injectFeatureConfig() call, as it this
happens twice, once when the first context is created which
would have been too early and once when LocApi open success.
- Resolved a race condition that second adapter added may not
have been in LocApi's adapter list yet when handleEngineUp()
is broadcast.

Change-Id: I8ecc18eab6b450c326c0be1abc011f70285439aa
CRs-Fixed: 2397902
3 files changed