s390/zcrypt: remove the exporting of ap_query_configuration

s390/zcrypt: remove the exporting of ap_query_configuration

The function ap_query_configuration is declared static and marked
EXPORT_SYMBOL, which is at best an odd combination. Because the
function is not used outside of the drivers/s390/crypto/ap_bus.c
file it is defined in, this commit removes the EXPORT_SYMBOL() marking.

Link: http://lkml.kernel.org/r/20190709122507.11158-1-efremov@linux.com
Fixes: 2fd0ba18696d ("s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h.")
Fixes: 308dcb855d5b ("s390/zcrypt: externalize AP config info query")
Signed-off-by: Denis Efremov <efremov@linux.com>
Reviewed-by: Harald Freudenberger <freude@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>