iio: Add new driver for icm20602

Support new IMU device of icm20602 based on I2C interface.

Icm20602 can provide accelerator or gyro and temperature data
through I2C 400 Kbps or SPI 10 Mbps interface. It can also share
the data to userspace based on the water level configured by the userspace.

Change-Id: Ibac2ce1be517eccbf1b548d88b33372637300dee
Signed-off-by: xuji <xuji@codeaurora.org>
11 files changed