Revert "Update SubscriptionInfo when the SIM transitions to a NOT_READY state."

This reverts commit 6c1c6edb.

This CL introduced a regression where the "No SIM" icon appears for a
few seconds during a cellular network switch. We will need to revert
it for now and come up with a better solution to the original problem.

Bug: 63404529
Change-Id: I6960b7d238427f20d3309d2383ab70db8f03d24e
Test: TreeHugger