Updates grouping behavior for the call log.

We are now using the following policy:

Voicemail and missed calls are grouped with following missed calls (not
voicemail) from the same number.

Incoming and outgoing calls are grouped with following incoming or
outgoing calls from the same number.

Bug: 4968671
Change-Id: I304baca0c02e10e9cbee1c9b01a573e28738fa2a
2 files changed