ARM: dts: Add support for fsm9900 RUMI

Added device tree entries for RUMI emulation target
for FSM9900 chipset.

Change-Id: I759e02ee89c9dd98b3c9fd9d45ef8a8b481928b7
Acked-by: Kaushik Sikdar <ksikdar@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>