Add support for the axp152 and axp209 PMICs to the pmic register access helpers. This is a preparation patch for moving the axp gpio code to a separate gpio driver. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Simon Glass <sjg@chromium.org> Acked-by: Ian Campbell <ijc@hellion.org.uk>