InCallUI: Store dialpad showing state (2/2)

Change-Id: Ief971979d3450e4ba9d0d62e1a7792e475477001
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
[3/7] Blacklist permission

Change-Id: I8f873376700843b4560ca12b58470767ff2068c0