ocfs2: convert to new timestamp accessors

[ Upstream commit fd6acbbc

 ]

Convert to using the new inode timestamp accessor functions.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://lore.kernel.org/r/20231004185347.80880-54-jlayton@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: 8c40984e

 ("ocfs2: update inode fsync transaction id in ocfs2_unlink and ocfs2_link")
Signed-off-by: Sasha Levin <sashal@kernel.org>