Disable eUICC settings when they aren't useful.

If a user never downloaded a profile onto their eUICC, there's no
reason to show settings to the user (as the settings UI will not
support profile downloads at launch; only API-based downloads will
function). But show the settings nonetheless if development settings
are enabled.

Bug: 38460669
Test: TreeHugger / Manual verification
Change-Id: I62cef15bd715a36a3fa1d38ea4e63c8134e5c09b
1 file changed