ARM: dts: msm: Add MDP Port 1 master node for APQ8084

Add a new master node for MDP Port 1 for APQ8084. Previously only one
MDP port was exposed to clients, now there is a requirement for the clients
to be able to control both MDP ports.

Change-Id: If2580433845e26a3a3c81e9ba471b508fe0585ff
Signed-off-by: Girish Mahadevan <girishm@codeaurora.org>