Allow notification expansion if multiple calls were missed or
blacklisted.

The expanded notification shows a list of the missed/blacklisted calls (up to 6) in
that case.

Change-Id: I471cad405aabe055f1757831ce7293ee182b3e6a

Conflicts:

	res/values/cm_strings.xml

Signed-off-by: igio90 <giovanni.rocca.90@gmail.com>