power: pmic: sunxi: guard DCDC5 separately

So far all sunxi boards programming the DCDC1 power rail on the AXP PMIC
also set the DCDC5 rail, so we could handle both with the same DCDC1
guard.
Some boards using the AXP313 will need to set DCDC1 now as well, and
since the AXP313 only has three buck converters, there will be no DCDC5,
so this trick is not going to work anymore.

Don't try to be too clever, and just protect programming the two DCDC
rails with two separate guards.

This has the interesting side effect of fixing operation on A80 boards,
using the AXP809 PMIC. Apparently programming DCDC5 right after DCDC1,
but before the other three rails caused some glitch, which made the board
hang during Linux boot, during the PSCI handler in U-Boot. Just keeping
the old setup order (DCDC1,2,3,4,5) will make those boards boot to the
Linux prompt again.

Fixes: ffb02942fab024d4a9b6a ("sunxi: board: simplify early PMIC setup conditions")
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>

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