telephony: Remove "managed roaming" feature

 * This feature shows a popup to ask the user if they want to scan for
   mobile networks if the current network is unavailable. It's confusing
   and overly aggressive, and there are other indicators when this
   happens anyway. Kill it.

Revert "Do not show roaming dialog if network scan is in progress."

This reverts commit 7935b65a4ecccf42004fbef389c58133d17704ca.

Revert "Phone(MSIM): Managed Roaming support for multisim"

This reverts commit 2b5ee374043b4f6460a1b29e72dd237b80877a79.

Change-Id: I10f973df18fc7de7f79f13b9f1509ed586e03688

Revert "Add Managed Roaming feature support."

This reverts commit 207dc957d761c2c7472c89db5b19e4ee66818d59.

Remove managed roaming translations

Change-Id: Ibd312162f897ceb7abd009b5587d3bf7319dd062