rtc: ds1685: use EXPORT_SYMBOL_GPL for ds1685_rtc_poweroff

stable inclusion
from stable-v5.10.195
commit 92de8497c34214b2509e51488aee58dd028f49ef
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I95JOC

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=92de8497c34214b2509e51488aee58dd028f49ef



--------------------------------

commit 95e7ebc6 upstream.

ds1685_rtc_poweroff is only used externally via symbol_get, which was
only ever intended for very internal symbols like this one.  Use
EXPORT_SYMBOL_GPL for it so that symbol_get can enforce only being used
on EXPORT_SYMBOL_GPL symbols.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Joshua Kinard <kumba@gentoo.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>