liburing: Add helper functions for fgetxattr and getxattr

Summary:

This adds the helper functions for:
- fgetxattr
- getxattr

Signed-off-by: Stefan Roesch <shr@fb.com>
Link: https://lore.kernel.org/r/20220323154457.3303391-4-shr@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
1 file changed