power: bq25890: add return values to error messages

Add more details to the error messages that indicate what went wrong
and use dev_err_probe() at a few places in the probe() path in order
to avoid error messages for deferred probe after which the driver probes
correctly.

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>