location: Use ILocationProvider Binder interface for all location providers.

This change eliminates the LocationProviderImpl class which had been used
for location providers running in the system process.
Now the LocationProvider base class is only used to implement the
LocationManager.createProvider() method for retrieving provider information.
Added a new IGpsStatusProvider interface for providers that serve GPS status.

Signed-off-by: Mike Lockwood <lockwood@android.com>
9 files changed