Support BQ25892 and BQ25896 chips by this driver. They shared one chip
ID 0, so distinquish them by device revisions (2 for 25896 and 1 for
25892).
Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>