Revert "eventfs: Delete eventfs_inode when the last dentry is freed"

Revert "eventfs: Delete eventfs_inode when the last dentry is freed"

This reverts commit ea4c30a0a73fb5cb2604539db550f1e620bb949c.

The eventfs was not designed properly and may have some hidden bugs in it.
Linus rewrote it properly and I trust his version more than this one. Revert
the backported patches for 6.6 and re-apply all the changes to make it
equivalent to Linus's version.

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>