Make SmsApplication checks more defensive

When SmsApplication::getApplication is called it will check to see if the
configured default SMS app and the phone package have the needed app ops
to work properly. If the call was made from a privilidged caller where
updateIfNeeded == true then the issue will be corrected, if the call was
made from an insecure caller we will return null indicating no default SMS
app which will cause client apps to know that they are not properly set
as the default SMS app. Either way we log an error.

When SmsApplication::setDefaultApplication is called we will ensure that
even if the previous app is no longer enabled or no longer set up as a
valid SMS app, we will still revoke it's OP_WRITE_SMS permission.

Bug: 11071837 Hangouts on KLP lost the WRITE_SMS permission
Change-Id: Ifea39a3d63e4ec3a30a6a1fa5834878dcc9ccfa0