update driver to support v3.18 IIO driver

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# IIO imu drivers configuration

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menu "Inertial measurement units"

source "drivers/staging/iio/imu/bmi160/Kconfig"

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# Bosch BMI160 IMU drivers configuration

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config SENSORS_BMI160_IIO

        tristate "BMI160 IMU IIO Driver"

        depends on I2C 

        help

	  If you say yes here you get support for Bosch Sensortec's

	  IMU drivers of BMI16x.

config SENSORS_BMI160_IIO_RING

        tristate "BMI160 IIO Ring Buffer Support"

        depends on SENSORS_BMI160_IIO

        select IIO_TRIGGERED_BUFFER if IIO_BUFFER

        help

         BMI160 IMU Driver support ring buffer operations.

endmenu

#

#Makefile for BMI160 IIO Driver

#

obj-y   += bmi160_i2c.o bmi160_core.o bmi160.o 

obj-y   += bmi160_ring.o

EXTRA_CFLAGS += -DBMI160_ENABLE_INT1

EXTRA_CFLAGS += -DBMI_USE_BASIC_I2C_FUNC