Platform: OLPC: Constify static struct regulator_ops

The only usage of it is to assign its address to the ops field in the
regulator_desc struct, which is a pointer to const struct regulator_ops.
Make it const to allow the compiler to put it in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20210206232152.58046-1-rikard.falkeborn@gmail.com


Signed-off-by: Hans de Goede <hdegoede@redhat.com>