sunxi: Add CONFIG_SUNXI_NO_PMIC to Marsboard A10 config

Marsboard A10 haven't any PMIC at all, so add CONFIG_SUNXI_NO_PMIC=y to
Marsboard_A10_defconfig

Signed-off-by: Aleksei Mamlin <mamlinav@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>