ARM: dts: apq8016: enable SPI master on LS connector

The 96Boards specification calls for one SPI bus master to be provided
on the Low Speed Expansion connector.

This commit replaces the currently enabled SPI1 -accessible
from the HS connector- with SPI0 -accesible from the LS connector.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>