MSIM: Dial emergency call on activated sub

Check if subscription activation status is activated, even if the
sim state is ready before choosing the subscription for making
emergency call. As sim ready state also comes when there is illegal
card event from network.

Change-Id: I1775619201d7cfe39362802b2b59193a67a9a1a7
CRs-Fixed: 662770
Telephony: Set the default uri for Ringer according to different sim cards

When the phone ringtone is set as "None", getActualRingtoneUriBySubId()
in framework return null.But null won't be set to Ringer, so the uri
is still the value which was set in the last time.

Set the default uri in Settings.System to the Ringer instead of
the uri returned from the method before.

CRs-Fixed: 661216

Change-Id: I82dd48a8946eebdca477dfae0e09b4ed640e481c