ARM: dts: msm: Add SPI and Ethernet nodes for msmsamarium

Add device node for SPI bus and an ethernet node as its
child. SPI Ethernet is connected to the first QUP instance
(QUP1) in samarium.

Change-Id: I79dd67f729a799bb7a19431a07a8016fa11153e1
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>