MLK-21314: crypto: caam: Fix double creation of debugfs main folder

MLK-21314: crypto: caam: Fix double creation of debugfs main folder

The creation of the root directory for the control driver of
the CAAM was done in enable_jobrings() and in init_debugfs()
stored in the variable dfs_root.

Both calls uses the same arguments hence the second creation
overrides the first one resulting in 2 entries in the debug FS
with the first one empty.

This patch removes the call from enable_jobrings().

The debug folder can be found in /sys/kernel/debug/*caam/ctl.

Fixes: de9807e6e0de (MLK-15473-1: crypto: caam: Add CAAM driver support for iMX8 soc family)
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Franck LENORMAND <franck.lenormand@nxp.com>