secdiscard: should pin_file to avoid moving blocks in F2FS

This file should avoid F2FS GC, since it directly access block device based
on fibmap.

Bug: 111659036
Change-Id: I15aef8175c23ba4029eb580e2dba59c77cca8227
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
1 file changed