io_uring: update parameter name in io_pin_pages function declaration

Rename first parameter in io_pin_pages from ubuf to uaddr for consistency
between declaration and implementation.

Signed-off-by: Long Li <leo.lilong@huawei.com>
Link: https://lore.kernel.org/r/20250509063015.3799255-1-leo.lilong@huaweicloud.com


Signed-off-by: Jens Axboe <axboe@kernel.dk>