commit 28d1e8cd
(regulator: palma: add ramp delay support through regulator constraints)

Removed the regulator's ti,step option from driver without updating the
documentation.

So, remove from documentation and example as well.
Signed-off-by: NNishanth Menon <nm@ti.com>
Signed-off-by: NMark Brown <broonie@linaro.org>