block call forwarding MMI codes from apps

Block call forwarding MMI codes from apps unless they are the
default dialer or system dialer

Also trampoline to default dialer using ACTION_DIAL

Bug: 268341970
Test: atest as well as manual test using adb shell
Change-Id: I4da38ff24595d4444e03ae363d3c8a51cc4087cb
6 files changed