This reverts commit 68f75060.

Michael reported that with this patch we loose the fix_io code path from
da9052_reg_update. Thus revert it.
Reported-by: NMichael Grzeschik <mgr@pengutronix.de>
Signed-off-by: NAxel Lin <axel.lin@ingics.com>
Signed-off-by: NMark Brown <broonie@linaro.org>