Limit the summary text for App info->Permissions to one line.

- the summary text is the list of permissions that the app has. It is
dynamic, and when the list is long, setting the summary will expand
the text view height and make the page launch looks janky. We cannot
pre-set the summary to certain line, since the permissions list for each
app is unknown beforehand. To avoid the jank, limit the summary to 1
line and truncate it if necessary.

Change-Id: I1acb1ac9f46c55808ce03626e53cf71502231ab2
Fix: 36413664
Test: make RunSettingsRoboTests