rilmodem: Fix memory leak
plugins: Fix memory leaks

In the case of ril plugin, the leak is due to devinfo atom being
created before the modem is powered. In that case, ofono core does
not clean up the atom when terminating.
Merge pull request #90 from alfonsosanchezbeato/fix-leaks

Fix memory leaks
gril: Add screen state request

This request informs ril of the current screen state.
rilmodem: Move radio settings defs to header

Move some function and struct definitions so we can re-use them for
mtkmodem driver.
mtkmodem: Create fast dormancy request

This request sets fast dormancy and its parameters.
mtkmodem: Add radio settings atom

This atom is needed as the way to set low power mode requires an
additional request.
build: Add mtkmodem radio settings atom
mtk: Use specific driver for radio settings
unit: Add screen state request tests
Merge pull request #91 from alfonsosanchezbeato/lowpowermode

Low power mode