Revert "eventfs: Use simple_recursive_removal() to clean up dentries"

Revert "eventfs: Use simple_recursive_removal() to clean up dentries"

This reverts commit 055907ad2c14838c90d63297f7bab8d180a5d844.

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>