Improve CalendarDataUtils.

Support ALL_STYLES which is used for parsing when no specific style is
required.

Don't return a Map for fields where names are ambiguous (mostly happens
when the style is NARROW).

Allow getDisplayName() to be used with ALL_STYLES as an alias to SHORT.

Modify CalendarTest to allow getDisplayNames with ALL_STYLES to return
more values than SHORT and LONG together (due to narrow styles).

Bug: 28832222
Test: artrun testng-time.xml
Test: CtsLibcoreTestCases
Change-Id: Iebde1c442380e7359af8dc369906092861b845cf
3 files changed