sunxi: Update axp152 voltage init values

All the dvfs tables we've use 1.4 volt when the A8 core runs at 1.08 GHz,
and so does the kernel, so we should use this in u-boot too, rather then 1.2V.

dcdc4 gets initialised to 1.25V on poweron and boot0 + boot1 + android leave
it at 1.25V unless the setting is overridden from the fex file. So 1.25V
seems a better default then 1.2V.

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