Clear mLoaded in IccRecords when SIM is disabled.

When AppState becomes DETECTED, clear mLoaded to false. Otherwise,
when SIM is disabled and enabled back, as mLoaded stayed true (never
cleared), Telephony thinks records are loaded as soon as AppState
is back to READY.

Bug: 142444973
Test: unittest
Change-Id: I5e39cc1ea6db72a956720e5684de5d6f397318cc