ika: Fix build for when ads1015 is a module.

CONFIG_SENSORS_ADS1015_MODULE is defined rather than
CONFIG_SENSORS_ADS1015 when built as a module.

Signed-off-by: California Sullivan <california.l.sullivan@intel.com>
modules: Add board file for spidev on the low speed io pins

This board file is based directly off of Darren's calamari.c file,
with minor modifications to use spidev instead of mcp320x.

Signed-off-by: California Sullivan <california.l.sullivan@intel.com>