ARM: dts: apq8064: add spi5 device node.

This patch adds spi5 device node, spi5 is used on ifc6410 on the
expansion connector.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>