Added the EmergencyInfoSlice for ContextualHomepage

- Generated a simple EmergencyInfo slice with fixed string in title and summary.
- Moved hardcode string into strings.xml
- Modified the contentProviderCall_returnCorrectSize test case for general version

Bug: 114793520
Test: compile and manual test
Change-Id: Ia3444c61b0f7e4c04794fe3590dc0731885cf062