cinterion: refactor the initial EPS related logic

Multiple changes that shouldn't affect behavior:

 * Avoid reusing the same context and state machine for the set and
   the load operations, because they truly have different behaviors.

 * Setup the common load operation in a separate async method, and
   reuse the common operation for both the runtime state loading and
   the settings configuration loading.

 * Avoid having a "generic step ready" method, and instead provide
   proper ready methods for each step, so that we can give
   comprehensive warning logs when things fail.

 * Use the common CFUN? response parser instead of a custom
   implementation.

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