The word 'descriptor' is misspelled throughout the tree.

Fix it up accordingly:
    decriptors -> descriptors

Link: https://lore.kernel.org/r/20200609124610.3445662-3-kieran.bingham+renesas@ideasonboard.com
Link: https://lore.kernel.org/r/20200609124610.3445662-12-kieran.bingham+renesas@ideasonboard.comSigned-off-by: NKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Acked-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>