Calling the ps_state/cs_state alternatives *ATTACH_STATUS* was confusing
because there is also a status field in the *serving_system structure.
This patch does a minor rename and adds the appropriate definitions for
the status field.
Get current signal strength (type: 0x01), not list of other signals strength
(0x10)
Without this fix:
- I can't get a signal strength on MC7430 because list does not exist
(only one signal strength).
- On MC7304, result is wrong