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
Signed-off-by: scotthartbti <scott.hart.bti@gmail.com>

Conflicts:
	res/values/strings.xml
	src/com/android/phone/CallNotifier.java
Phone: Display toast message for blank USSD request

As per spec 24.080, ussd response string should be
between 1 - 160.
When user requests SEND_USSD with blank/no
input, display toast message prompting user
to enter valid input.

Bug: 7471891
Change-Id: Ic7b7b89e8a683011048a19cabd1d36a27bbae953