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: I6ff88caf1b397b0d5cff9a8ce2ea42531e1572a0
Signed-off-by: Abinaya P <abinayap@codeaurora.org>