staging: vme_user: add space around operators

Add a space before and after the operator, for readability.

Reported by checkpatch script:

" CHECK: spaces preferred around that '+', '<<' and '>>' ".

Signed-off-by: Menna Mahmoud <eng.mennamahmoud.mm@gmail.com>
Link: https://lore.kernel.org/r/57006c151d4d95550b987143a6650f8b3594ddea.1678899549.git.eng.mennamahmoud.mm@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>