MSIM: Add support for cell info

Add suport for getAllCellInfo in MSIM

Change-Id: I9a43441ad6df9b88fa0c510ee460c49f860336c8
CRs-Fixed: 654445
MSIM:Add null check to avoid phone app crash

When both subscriptions have incoming calls in alerting state, and
both of them disconnected at remote end at same time, Call can be null
in onDisconnect() due to timing issue. Add null check to avoid phone app
crash.

Change-Id: I5c5448765526cc9b6e856476fa05fe9761c2be0e
CRs-Fixed: 652172
Disable Search networks button after slecting it

Disable Search networks button after slecting it,
to control user to select multiple times while disabling data.

Change-Id: I40465982d6515f58a883d6bdfffeb5295d95aaba
CRs-Fixed: 659709
Disable data on any SUB in manual PLMN search

In manual PLMN search disable data if it is connected
 on any SUB. After search completed enable data connection.

Change-Id: I4fdbadd0a568986a64398c78e04eab7ffa37637a
CRs-Fixed: 660590