Cleanup enterprise feature in ContactUtil

1. Remove isWorkProfileSupported checking, api level checking is enough.
2. Replace the hardcoded uri with the corresponding api.

BUG=26797244
BUG=28016344
(cherry picked from commit 0d7a1cce157e4ffb26d5fefb9908bbeffcb1d03c)

Change-Id: I76edad19dc6a19aa77b523cb960f716fca08944d
1 file changed