regulator: qcom_spmi: Fix docs for PM8004

Fixes: 2e36e140 ("regulator: qcom_spmi: Add support for PM8004 regulators")

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Link: https://lore.kernel.org/r/20200127231439.3562452-1-petr.vorel@gmail.com


Signed-off-by: Mark Brown <broonie@kernel.org>