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

Fix to send initial attach apn

If there is no IA/default apn then do not perform initial
attach with any other available apns.

Change-Id: Ie3241747eb44df9070f2cb4874f13878f8ca3d9b
CRs-Fixed: 2178888