icm20602: Add new driver of icm20602

Support new IMU device icm20602 based on I2C interface

Icm20602 can provide accel/gyro and temperature data through
i2c in 400kb/s or spi 10mb/s interface.
Icm20602 driver can  push the data to userspace in a water level
which is config by the driver application.

Change-Id: I138ab362254c95a9196623fa2263f56a00f40874
Signed-off-by: zhaochen <zhaochen@codeaurora.org>