nvdimm: make __nvdimm_security_overwrite_query static

This symbol is not used outside of security.c, so marks it static.

drivers/nvdimm/security.c:411:6: warning: no previous prototype for function '__nvdimm_security_overwrite_query'.

Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2148


Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/20220914061251.42052-1-jiapeng.chong@linux.alibaba.com


Signed-off-by: Dan Williams <dan.j.williams@intel.com>