cdma: Restore SVDO after merge.

Allow evdo/ehrpd + voice simutaneously.
Use ro.ril.svdo=true

Change-Id: If7be25edc10f21680adbe3a059370d77a82ef076
Revert "cdma: Restore SVDO after merge."

This reverts commit ecefc8bf558d4e40b1f5b5db4ed1142fbf1b457f.