UiccController: use registerForAvailable only when persist.radio.apm_sim...

..._not_pwdn is enabled

Some QCOM RILs allow the SIM to be loaded in airplane mode, thus
CAF changed the callback to registerForAvailable, but that does
not work on other RILs where the SIM information will not be
loaded successfully.

Change-Id: I9f9124417db2fe983e716a2825fc08d87511f8aa