ARM: dts: msm: add support for SMP2P shutdown ack from modem

Add the device entry to define the SMP2P interface for shutdown
acknowledgment from modem after SSCTL command is sent from MPSS
to APPS. Also define the correct SSCTL instance ID to register the
SSCTL QMI service.

Change-Id: I8420857df0c0b9d364b04fb465b79c331f3881cd
Signed-off-by: Sanjay Dwivedi <sanjaykd@codeaurora.org>