Contacts: list rejected calls separately [2/3]

This makes a new category of "Rejected Calls"
Thus from earlier categories
INCOMING, OUTGOING, MISSED, VOICEMAIL
we now have
INCOMING, OUTGOING, MISSED, VOICEMAIL, REJECTED

in call log, we can see rejected calls like the other
categories

supporting patches in
frameworks/base : to initialize REJECTED_TYPE integer
packages/apps/Phone : to list rejected calls as REJECTED_TYPE
                      when they are rejected from ringer screen

PS2 : also included listing of rejected calls in statistics

Change-Id: I3b09fd4a71a8fdd361d9785d08eb9a07ca16b8f5
Signed-off-by: ChampionSwimmer <android@championswimmer.tk>