ARM: dts: msm: Add EUD device node for SM6150

The EUD (Embedded USB Debugger) is a mini-USB hub implemented
on chip to support the USB-based debug and trace capabilities.
Add device tree node to support EUD on sm6150 based platforms.

Change-Id: I166cd774879c3fa9c51f8cbe97a4f5548f34fd4d
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>