sunxi: Kconfig: Fix default order for V3s DRAM clock

sunxi: Kconfig: Fix default order for V3s DRAM clock

The V3s (using co-packaged DRAM) runs at 360 MHz, which is specified in
the common platform Kconfig file. However the value for MACH_SUN8I will
be picked up instead due to ordering.

Re-order the defaults to have MACH_SUN8I_V3S before MACH_SUN8I and let
it select the correct default. Also update the LicheePi Zero Dock
defconfig to remove the value, which is now correctly selected.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>