LU-18103 llite: Apply the change of splice_read

LU-18103 llite: Apply the change of splice_read

Upstream changes in kernel v6.4-rc2-3-g69df79a45111
("splice: Rename direct_splice_read() to copy_splice_read()")
the rule of splice_read().  For newer kernels we now
choose copy_splice_read() to adapt it.

Test-Parameters: mdtcount=4 mdscount=2 env=SANITY_EXCEPT="17e 27J 103" clientdistro=ubuntu2404 testlist=sanity
Signed-off-by: Yang Sheng <ys@whamcloud.com>
Change-Id: Ic13da773691ada3c21b9803f65ea3e2533f7885a
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56093
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Qian Yingjin <qian@ddn.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>