Fix SMS and Calls preference summary displays empty.

SMS and Calls preference summary set to summary_placeholder in displayPreference's every call. But displayPreference can be called multiple times, so it may result in SMS and Calls preference summary displays empty when refreshSummary is not explicitly called after displayPreference's last call.

Move the summary placeholder setting to layout xml.

Bug: 331874741
Change-Id: I4c6f34dd813fa9a6d7e2c4df2cac279679ee6960
2 files changed