Telephony: Send INITIAL_ATTACH only when it is applicable.

Issue is that SET_INITIAL_ATTACH is being sent whenever subId changes.

During bootup subId does change before records gets loaded. This results
in SET_INITIAL_ATTACH with incorrect APN setting/profile.

Solution is to send SET_INITIAL_ATTACH only when cdmaSubscriptionSource
is RUIM based and records have been loaded.

Change-Id: I68280db4831935326c732943e5b763d3b3a4c3fe