EmergencyCryptkeeperText: Make sure we update if airplane mode changes

Fixes a race condition that could case the emergency text
to show when it should not, if airplane mode was queried
before it was set by the radio layer.

Change-Id: I146f2877e300d105d8a53af130be46b02ec965b2
Test: Boot into cryptkeeper with a SIM, verify that it does not show 'Emergency Calls Only' until emergency call is initiated.
Fixes: 33278862
Fixes: 32063642