hwspinlock: omap: Remove unneeded check for OF node

We do not use the OF node anymore, nor does it matter how
we got to probe, so remove the check for of_node.

Signed-off-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20240208165114.63148-1-afd@ti.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>