ContactsProvider: Make ContactCounts public like cm11

* Needed for Mms recipients list

Change-Id: I50010dc9d9759ecd04676df192ca2639e62d295b
base: fix public api breakage

Change-Id: Ic25b507e66d42ae172cf031e97d14965d3a54aa0
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>